Malicious PDF — malware analysis report

Static analysis result for SHA-256 beae5ebd7e7ff6fd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 04:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5fc01c3b884cd0212947ddf5f49a34c SHA-1: 50912c20d051264f86163c48d24bdc92d93ab4ab SHA-256: beae5ebd7e7ff6fd202f382564ab13dbfa3e60b2de24d6e05e43b8591c26c247
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. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised WordPress sites hosting other PDFs. This suggests a tactic to distribute further malicious content or engage in SEO poisoning. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934d9b87c3f---43982286302.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b413136a83d---68502082929.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86c2d0ae7---bulez.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/94ab6b4eb185a66760ce8092665a9601/81533691649.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jerepone.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sibuw.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/toxibodakex.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089099453246---kudavisivejarupe.pdfIn PDF document text
    • http://attlas.center/userfiles/file/defajekujutepisekixuf.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/golaneporebemutotewo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2shle53bf5pvo01ca5kp2kmu3r/91042315928.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1d38d9c1---79507937134.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/5954337972.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/5391358730.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/69130089893.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/85ff8d3d702941ce3118b95e48d706ce/19290186277.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/65482930441.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b2e67a1174c5268602ae0a9ae945a3f5/tamuralibufuxowategujanot.pdfIn PDF document text
    • https://somogyplusz.hu/files/76655579249.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea8935a96---lutezudojak.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/f7oqjmaam3rbq226hen6uo3lkp/kexewariwi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bc25758d1fd785c758a40a6cf1126abd/18705915122.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/vikakufiguxumonoba.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4c3d8b9c2155582c539153dbcf023457/45808189207.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5b8e50abcbef9d0d97468801e9841b41/dimanulitinetesotiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=graphing+lines+in+standard+form+worksheet+answersPDF 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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 19840 bytes
SHA-256: 356297b44cb308b4b33cf7aa1db8671473f36a7ddf9dbd239b8b6ed11d5c940f
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 11164 bytes
SHA-256: a16aca4f868c0d173cfa349d2df4680f8f794621f8e4798526a38012c6dc5378