Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c1d616590acaa1…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 18:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b16d79e729f71b7d4d5abc3974347f0d SHA-1: e8aa36c1dc05de15880a54a59574a1207f5f9673 SHA-256: a3c1d616590acaa16e436332c4fab6197a49ef55ae7f85983c12d96db5585b16
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary goal appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://h1t-url12shio-turbo.com/contents/files/migovibuvisagemegubudivif.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/40953445943.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c041061583---metupabikivokejuti.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/beziw.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/wefel.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/lodaxapizazilekizukosid.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/30203201002.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c96a089791c0612adc1315b3cf9b5f3e/39870137915.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/ravifaxeridakezorilid.pdfIn PDF document text
    • https://banifatemeh.org/data/file/pozofiwinagubazoka.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613666d1130a8---vebokenegaj.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/76757686599.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/33785312514.pdfIn PDF document text
    • http://naviway.su/upload/files/62511860666.pdfIn PDF document text
    • http://unseretochter.com/images/file/85656423871.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/40788680853.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/pigemof.pdfIn PDF document text
    • http://szcftz.com/upload/kewawututezavexusam.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/didajenarilipokox.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/rofosevoxin.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/badetalibesodemegivigi.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/putenidusofitedarusebo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nufabun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=google+voice+actions+not+workingPDF 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_off0000ae95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE95 10688 bytes
SHA-256: 497508ed3ddb3357008af3145f60661cd58f36b7f5286fe849524bd57f5ca0d4
font_01_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 15432 bytes
SHA-256: 08d88501777187104006db451c3a2c9e5ae4d99329fd2a305416ac20b3409ad8
font_02_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1