Malicious PDF — malware analysis report

Static analysis result for SHA-256 b271705e2aeca339…

MALICIOUS

PDF

79.8 KB Created: 2021-07-26 06:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc14ae3a3b7fe128d8359dfe24669228 SHA-1: 8fbee60aa8b2bd705ec7a78ca6dbf32090a64532 SHA-256: b271705e2aeca3392e7f99111cbcca599751adb3f117922603fe276fe4e926d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://aarogyamedico.com/userfiles/file/39508329857.pdf In PDF document text
    • http://dongkoo.com/uploads/editor/files/duxerobelujer.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/jonafimuzuxo.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/duwumajiruwudipalazamu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/suzilitabunekogat.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/budisawufirumomefiruzod.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/37822613869.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc47770d1---rejejozafajem.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/sogun.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/g798bvo5ifelg4kq2s0t5l9bu2/63042663312.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/atdqjals6u0koh44h3me4nrs70/13981834814.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094774fa4b6c---42497752761.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/vuzetuwefewevuvawiw.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/beron.pdfIn PDF document text
    • http://zuche0551.com/upload/file/15986559884.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/78510773221.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kodupazuzawul.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/53061253846.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44411e077a---45731968021.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/48d591a8ec1f90c5a287c7139540d423/lesejave.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f824302ffad4e88c4f17379789fef3d3/96423750144.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160890587d78c1---89045512460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pj+masks+hero+academy+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 17168 bytes
SHA-256: 78327e50700fbde7a987cfcd669372d6e8c03f9685afe1333c983ea1480e2aa9
font_02_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 2048 bytes
SHA-256: 53893d743b1ae511daa28b95744730efc37609e29066ed6636143165724b8dd0
font_03_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10776 bytes
SHA-256: 501cc110ba245973e214c40e377aa8109993fac3030a80b55d0e1bd9104be5bd

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