Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4795012ad73c11…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 21:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6845076da360965565df11bef3a2be5a SHA-1: c5f219a77fb7adc409ca8ba491b3ae00f409cce8 SHA-256: 4d4795012ad73c11c9fb11d50e9e84fea6e6f27ff8d65f41a8f888ee51be1018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 https://amursvoidom.ru/media/files/64261893968.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a9a824e5---kukorusunamoribopi.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591b80dcd2---48623197012.pdf
    • http://tuanayapim.com/rsm/files/zisokitul.pdf
    • http://aylincinarli.com/fckfiles/file/zejaritaparitopilibu.pdf
    • http://bunny888.com/ckfinder/userfiles/files/33141930891.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609459682e5f3---zodukezelojurivu.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/5849111b41b855db61496b42617c3622/77399509891.pdf
    • https://floresdeserrezuela.com/aym_image/files/gubiposoburupix.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a74415ff4b---56225248948.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47052128df---kefapenaguzaxolugizodi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c69b59b05cf00bfe0c9471f6785c3d0/bivowokatatasud.pdf
    • http://tranhdaquydep.vn/upload/files/kenalezisikijuxutika.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4c4349805---wamigowosi.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a9f425dc---livuveniximokimeviv.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbf95d6ea5---zixifej.pdf
    • https://nikosdimos.gr/userfiles/file/pujokimeda.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608369f711bb5---17565519868.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f10cfc56---timinopotu.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/setosimonox.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/83c2448e4aa3a93f89bc24212b1f754b/gexumuwuwipibuseludufo.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/govinofugixesufitujax.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082704b3eac3---luvuvimipexituzuti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=camera+raw+2020+download
    • 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_off0000e9bf.bin
49abcfef8d55f833f0e7bf1ecde183f027d565f8afcd56acd67a37fc02dc0cbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 17988 bytes
font_01_sfnt_off0001195a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 16792 bytes
font_02_sfnt_off00013171.bin
1ca9b0cbafa097f6c6ef641b8679e26630c1bc29b8d5ba830991fe3a52a26963
pdf-font-stream PDF embedded font (sfnt) at offset 0x13171 10412 bytes