Malicious PDF — malware analysis report

Static analysis result for SHA-256 973e1a7157fc57a8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 12:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb581dbdc5b5133dea2204e542df8129 SHA-1: 00aedf9f6ce1e38268495293c65c58f7f64f75fd SHA-256: 973e1a7157fc57a887ea6f7786899032120a71cc5790a04494263e1c198712f9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a chain of redirection likely intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40aab1c5b---66813245585.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/69h4p8bd3hg24s1vm53022b8i3/42173813227.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02bce75ef5824ec9f438b8fc98e395a6/51292802029.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc52f170c5a---5986198283.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/wesigiduxidid.pdfIn PDF document text
    • http://vlajamo.cz/images/file/zovetapovefiz.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/98478894610.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/rewusufojinebimanipul.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/vinuxirisid.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/317b639bdbaa024c452e504acf3f8247/60988015351.pdfIn PDF document text
    • https://arerp.kr/data/file///venazojeriwejagoge.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/saxadulixezap.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/97839028537.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/lokovesivutigalebojiro.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4itqtio4lsrt4fsft43oim9kp9/77380928101.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/veruzokita.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bomududobajoj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077feeb4e12f---35267687964.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/76950986777.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/vojigokojedobagugof.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9bc95d75b76272af6a6098484d62220f/vewetazudesen.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1aa7c068e---jifudejafupevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=microsoft+excel+worksheet+onlinePDF 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_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10544 bytes
SHA-256: ed5ef09836c8ed4f66631bd213c797a0433762237b7f36aacde66dca3da092ba
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 17540 bytes
SHA-256: 4b9d45fc1669b4c6c1cb1bb77a90d26bb0c3fca18a5fb6ca23aebb0fb838ba3f
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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