Malicious PDF — malware analysis report

Static analysis result for SHA-256 37392a175bbdc45a…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cc31d8c07afed34ba31b516dcd8c5bb SHA-1: 9df66a975da565990252337d6d86765d55efa323 SHA-256: 37392a175bbdc45a7f07325544397d1dc15038be4bec719bab6f36ede2b27617
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of urgency and callback lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mayurherbal.com/userfiles/file/96677746384.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b65aa4eb9---sawavedowulavozuvus.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/ad13d27a0bae8229be8d9e039cb40544/majavazapepukipopuzomewob.pdfIn PDF document text
    • http://usagimatur.com/files/others/setifulalokag.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db4f9363e---kijawabejedoleloda.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/wokimibo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b56f001c22eb5c571b85a1d948f6a917/70485319955.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b60c9be2c2---82948530074.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/jipofawan.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/e59nohvs70tu504mqf8mn244bs/wufijapubewutimezumalap.pdfIn PDF document text
    • http://ciskmv.com/css/file/dekedufozijokorerujada.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aedb648c1---31591205452.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/15541432039.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fe66c6a36db34fbe728d0ec5d7ef1b5d/kupegeresijuwa.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b967ce08977---71695409270.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d379a2c5f2---luwufezuwotowixa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e74d56ea3334088cd8f67d5e1cfb6757/7144322018.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bdff13138a10c81c331488b5f652d190/27828044383.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/vugetezizonedexagup.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ca17cdc731971e51d9a1519d49c79be/bupigimurun.pdfIn PDF document text
    • http://meta-min.com/files/40210705674.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/bozexaxe.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/96922678236.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/7235118101.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/scgj636reqtoiorohr5cjdorr0/43363943621.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/kipulipuvenudomupideje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=feasibility+study+on+bakery+business+in+nigeria+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 17992 bytes
SHA-256: dd141676b02b5f83193e3f2e2c10ee3fd63e9882f305c74a73e0358aaf672480
font_01_sfnt_off00012935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12935 11096 bytes
SHA-256: c0f35060e32ef297a6ea355d486049d1af9adb029c8b31f23f404bb2d4d3f0c5
font_02_sfnt_off000142c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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