Malicious PDF — malware analysis report

Static analysis result for SHA-256 040f4bfeb4bffdd3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 00:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6618bb5adc7d0bfd356b79fe18f985de SHA-1: 8ce2d44eb142a6e382548b598059b1e688ddeb17 SHA-256: 040f4bfeb4bffdd363bdad420618cdac4ddbc1e93595b1b15ae5446515905f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised CMS uploads or disposable hosting. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests an attempt to distribute malicious files or redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.naraihillgolf.com/admin/userfiles/file/xutamana.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa697aef1---42787911321.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19f14e240a---funopulugitijijotasem.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/78070951385.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/misepodosim.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/madotigakuligasufabud.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/19106184782.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/58627690166.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73648543f3---43172247838.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1282f1198---gepunamifam.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/15114791945.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/cb645ce388980b597a472317c70fdbc8/7320002727.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///bukikoxesasunamodaju.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/36601612658.pdfIn PDF document text
    • http://farmina.ru/uploads/files/gedibuxin.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b673c0bd2---pewadutoruwape.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/kowomulikutomubetivadoka.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/41567106825.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/28749520058.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/89006c5190cd99113ced8a59d2d2ce29/15042518032.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b0125872---bozulalikovajajubovomus.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda543554c---78612666160.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204e933451f---banina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chemical+bonding+pdf+mcqPDF 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_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 11020 bytes
SHA-256: c54603436ed8bd8f3a34ba527664e41d6291dbdf8502adcfb6f701f220479fca
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 17568 bytes
SHA-256: e09adbb24d9685caf4cbf2b8c028f5cece9a9626e937adfabc70d686282c9c75
font_02_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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