Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d2527d3ff07610…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 14:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4486e133ff73af6f55400c605117adf SHA-1: 29a1dac122943d3ce133191909fc71db965d47ad SHA-256: a3d2527d3ff0761076e5fbc49642d86333cf4945e3e00afe1efbb19392a0bc3a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://elosc.com/upFile/file///ITX202109041836587003.pdf In PDF document text
    • http://belly.bpv.su/content/files/files/fusetizejabijolaxaf.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/81274593846.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e68aedf92b54c25ca6fc089fa2effac4/63060453822.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee38bd8f18---88611640505.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/lalopizefopakiximemu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/bojeregiremizorowivufiven.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/80535651281.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161395fa1dd150---xevikufezelerofekokewo.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/39958952963.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/31748577080.pdfIn PDF document text
    • https://kapefashion.com/files/files/16498039339.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/70741557987.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8958daf7---soxotijiwebifazukake.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210902071552.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2f0c99a---kimosategifowukebobosebo.pdfIn PDF document text
    • http://unibox.lv/files/text/42133513818.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/46659898628.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/debufadapu.pdfIn PDF document text
    • https://isosklo.cz/uploads/tefemuke.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/87107611311.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/19044782354.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/zanewumulasozekotusejisom.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/73433578061.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/sixijapodekapulu.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/kinimuwuxilemenubej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lep%27s+world+3+old+versionPDF 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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 16496 bytes
SHA-256: 4bf2e7d06e8e96fc229c8a0ceaa7d3ab4eae42c653024e813c4d8003c473041a
font_01_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 10440 bytes
SHA-256: 47f64e8a65eb613dba0c800e56c5c94e65dc0599bacffaaf4edb9cd82f3adcb6
font_02_sfnt_off000107f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1