Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1e0641e067489c…

MALICIOUS

PDF

70.5 KB Created: 2021-05-29 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fc8d0d31043573c500ea84f489439c50 SHA-1: 799793dc7ddf41a59abfc16cc7cc97a67cb72057 SHA-256: bc1e0641e067489c95f42f0129b8a765c45a7022263b5e72ab5c2df08d5cb2db
156 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or providing sensitive information. The document body, though partially corrupted, contains a lure related to aerobic respiration, which is likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wurbs-hanau.de/userfiles/file/molam.pdf In PDF document text
    • http://mp-journal.com/media/file/98452375050.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/14145910493.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/39f93ea9215dd747d2ad256694d838a4/gididetatanilito.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6761d13f79299848d627cc592bfdd528/11503977703.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/eb5ec23919aa1c972f4da529d4f66ff4/20818829763.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718a44cc836---35571613175.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed97f6316c---25115156452.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wamelibenafekozewu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/62454571200.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/ce1b98424981c839a66b716116ea7dd1/savilixabeduwin.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/57e5p9rrbsf5v0610s4oqb0m4q/kujijutejojavonekedidij.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/a568341f5b94c7cba548d34e55dd4841/zemedowesaxupajadigotibo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1jclbru3oacsvbcgfcj7bb0v57/64584727268.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/110aba922fddb32eb9466ca5d9a0685f/xokiwowasutomejidef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+two+molecules+are+needed+for+aerobic+respirationPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 5640 bytes
SHA-256: e050194773326e3db43724364b5983b748f285e6668fe2e7d1dd74e6c11a2126
font_01_sfnt_off0000e59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59D 10968 bytes
SHA-256: 7c58dd03011fa16be9e5e028940c63a782ee1fb484126bc6a193d87b72d6176e