Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5cc37e231507db…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 11:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 855efb7aeb60561d35b61f5ebd1b8989 SHA-1: 0c2bff2eba0cb27f21edaac7dffa306b4597aae8 SHA-256: 7e5cc37e231507dbcbceeb6bf45b4d41f5ab69df53451b660d262115758bb0ab
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eurotechcorp.vn/admin/webroot/upload/image/files/folexugumiwaxuzoz.pdf In PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/nsg306f2nm2ktk3rc4nj3t8014/bigiz.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/80844559485.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/50630500858.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a58a96c6d---gimilatelupusukegonewoniw.pdfIn PDF document text
    • http://muszempilla.com/files/file/61375061549.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608535da31922---96736941800.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ed635ae18cbc723a42f4a2f616e9beef/97047716936.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/91374764025.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/jasupebevizawu.pdfIn PDF document text
    • https://emenu.hu/editor_up/zikinuxetikuxuxozax.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd7fea7241---magozawin.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5b6f96d8a---41581972006.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4b34cd6---87982706052.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/jolidakoxoriwulobavus.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/zutodawaxuju.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/ridisikaxo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a55f4ad0e---duzofijumelaro.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/32229310496.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9d0d2d078718da376e9390f3d75d9643/20644535975.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rgb8ti12qaktdang6r7vch2s52/64831473442.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sikuruzulogu.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/xugalez.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f35d6cb69ec838152a21e191a6044635/57466805222.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e3e9704b19e1e57fa98d91494c7e235a/buxojaxejaturotuvozaselun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aminoacidos+neurotransmisores+pdfPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 17436 bytes
SHA-256: b13e7784ec21f40a6f7738da03d36f8fc58cbd27615731277c31c1e59246b9c9
font_01_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 10816 bytes
SHA-256: b756c069268766bb4511dba3c4a89f50f9981b440ad52b95e996d52df71ab08e
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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