Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc336f141113327…

MALICIOUS

PDF

84.6 KB Created: 2021-07-05 01:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80b8c2c11bc0660fb234eefe39f8d179 SHA-1: 54b5c6fcbc6d303374f40cbcc25be8df3a8d8ee9 SHA-256: dfc336f141113327010189bd48b1e8e7c74d59c7ba98b51c7c6c0c40d43e47f3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb41f850e1---xolopokazamukoxupuzum.pdf
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/nezopolusoti.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/44bda45cd3f27294e699edd556f1dda7/susojamerixewijikiziber.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82adbcdc3---nipase.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/70a2cc9b632882b09e4f7d03918c9491/wazomijob.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f20f21ccf89896eaa6c47c977458bc65/lawifo.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/17958873821.pdf
    • http://bidmitt.com/img/files/file/legagafibekevixe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7c82d963---zopulekiwomazasirojoxag.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b9b0b51e---40467032794.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b896e1b9e5f---samubakimewomulowenuv.pdf
    • https://telewebmarketing.com/FCKeditor/file/23390385600.pdf
    • http://dyglas.com/userData/board/file/nazeveto.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b794907e7---48491421878.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/sabigiwepite.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/80b765912d10cc1b9e77b2ff3458cdcd/mekifatugemopalivifegino.pdf
    • https://b2cexpressdemo.com/userfiles/file/71602498647.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/ndk4jd6a1it7f44of0eeo5jhip/7240950652.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608879891fa64---15766269846.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/92e78edca1911f48a4d6d0657f43ff2d/5599718437.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff5148901f---getonizixijowuwi.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2d959953e---kutudok.pdf
    • http://digifast.cz/userfiles/48799690932.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=and+there+shall+be+no+more+death
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3f.bin
3f0cc615caef726cc3c5a2ec410cec446bf0a03401d7a2866a132ad061041465
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10540 bytes
font_01_sfnt_off0001020c.bin
4f46eaf30b1e5772cc612cf6764247e1daefd109c1c535902c16a41a4b3d4182
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16524 bytes
font_02_sfnt_off00012d02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 16792 bytes