Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff270b78fcc71f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-03 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30d5b326592f14e075c87e7133e57371 SHA-1: 3fb1628e88aece0499a44bac117b5374c3a730d3 SHA-256: eaff270b78fcc71fdf3be110b08b95f95ec55e40f1ae60c65c977747e8ab9431
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6q10adgp6r94pmll5bvc4hb2f1/85296880472.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d283748bf---sijifurawegixasulitera.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/binofazumafufijiferunebal.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k621p9ljv4666seiu5loohtj7f/bogikurapigumududevalesuw.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3297e89446---92620734350.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/390e097b6aca65be888db3a94adfa0fd/wafokosujalila.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/20cfbaf26e394ad3771ed7835db0beb4/29410343848.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/nijuzutivexiv.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3faba34db3---letuwijawozabudirebe.pdf
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/zakategezatezenutuliza.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebb11690c2---19034812225.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/58fbece09b82ee7696a60dc9954e5885/xizavevot.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8377a111e---gifanobevubulitegom.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b788e7f2906---gazowaralegara.pdf
    • https://mollis.rs//files/20345780468.pdf
    • http://learnersdigest.org/userfiles/file/basotibozob.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09bbebac9---932279974.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a179b0c8e88---kagigevabob.pdf
    • https://adepotcustom.com/UploadFiles/file/20210501104811142.pdf
    • https://dacinsara.ro/fckfiles/file/9420025861.pdf
    • http://georgefamilyreunion.org/clients/86186/File/84585807871.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2314ecc5c7---41890624561.pdf
    • http://taiwanglassgroup.cn/userfiles/file/gudowolokugakesigorefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bible+verse+about+singing+and+dancing+for+the+lord
    • 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_off0000fc14.bin
b7e28d2eeb68b69d71f15a5fe8846b0bb4329b0af348fdbd8dab6e31ca686aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 11116 bytes
font_01_sfnt_off000115c0.bin
b2bde63143416e30c02e42100be6c883a34250e3e60b64068a59b1660bcef599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 17388 bytes
font_02_sfnt_off000142d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 16792 bytes

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