Malicious PDF — malware analysis report

Static analysis result for SHA-256 410d92a15ed5e90c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-14 05:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5f39234953c2001fc7193e8c0501b0f7 SHA-1: 3e1717113a666d5518d53e24f61f09059c6b1474 SHA-256: 410d92a15ed5e90c1fdd75eb14c78ef972ce440ece1e405b85dd0c6e8c6a201f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm hosted on disposable domains and a link pointing to a compromised WordPress upload, suggesting it's used to redirect users to potentially malicious content. The PDF structure itself is also flagged for duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://videlec.be/ressource/file/51030259209.pdf In PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/tenizuvesewobasemesilude.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1eb529d89beb0ae56b8227c18519b941/nowimaxeketazazo.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/36344750711.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/24415583557.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131552839c09---junenezomirotalexomiv.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8868770933.pdfIn PDF document text
    • http://www.agot.pl/upload/file/34318396750.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9ee6816cf1833d43b19796d814c018f7/jokujexejir.pdfIn PDF document text
    • https://path.mn/userfiles/files/87797341417.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/27492683018.pdfIn PDF document text
    • http://bankerz.in/qpic/files/jixiwi.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/86330292040.pdfIn PDF document text
    • http://saint-party.com/media/file/46332162557.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613245817dc0c---vawun.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/norotowanina.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/tubenedakudizuluma.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/teredefigutugerixuxamodej.pdfIn PDF document text
    • https://alariel.be/userfiles/file/wewisuvomuf.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/wagifofijipibu.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87893885660.pdfIn PDF document text
    • https://diphong.com/uploads/zizasoninurivejotoxax.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/zazimavabipibaludogizulud.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/marufeworazofatil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=inshot+app+hack+version+downloadPDF 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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 16520 bytes
SHA-256: 8bf0e097a25b4f3d08818c15f4d251b603b575042a1d1b1618e958c1f4fb5982
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 10804 bytes
SHA-256: 351e97de7392b62024f4f763ba53f8b52fdbf776d1f70659b0c5707e42c58561