Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6048ebf438e0dd5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 07:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a3dc3643f1f0881eb10d678e21fe701 SHA-1: 7e08bb6d67f6e2bcb166591e36208b3fd8ae69d7 SHA-256: a6048ebf438e0dd537b2a47abe19b01481de334fca5628e6b3aa53737bc99cf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://automsystem.com/UploadFile/file/20210613000005952.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd2a4a9721---33946166919.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/22321560212.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/14739154780.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • http://rochesteradams75.com/clients/7/77/774a1ed2e17b5a3c8fe4214cc08eab78/File/nuxezolabedusufuxazolu.pdfIn PDF document text
    • https://podimercrm.com/img/files/zogurawubiregegisora.pdfIn PDF document text
    • http://abpaluso.com/upload/file/80474812386.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/68408741278.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/92991395975.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69b367161---morive.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d6688eed569d1213cf2b1f352e12de62/31084165983.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/84c676e4120df23b3eabd7bbbf411a42/3722904818.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be3374574f---mudikowepefeg.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73476570781.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/worudufivarexigezusam.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2333aef069c41521725ed1b7e7f7864d/poruxive.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873f7baba1---84040509127.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/fomitibotukepewad.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc244d4c6a0---xixorumoritowu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e7f407e1---90568457396.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=regalos+manuales+para+mi+novia+en+san+valentinPDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 10804 bytes
SHA-256: ee3bfd14c23b06241cd74d0a21a7ccb06bb91b57d9a75a82408af62450c404c6
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 20424 bytes
SHA-256: 1400c2f773079171f52dd85f0f3b32dbebf20580c3478f9c0413e946eb465a76
font_02_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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