Malicious PDF — malware analysis report

Static analysis result for SHA-256 628f61b30769e99b…

MALICIOUS

PDF

89.9 KB Created: 2021-08-05 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c081c35b1672d5c2b873d502fae27a90 SHA-1: 20baec238e5d4919122663875541a50d3004deb0 SHA-256: 628f61b30769e99b9a4ed8d790a2839b2fbbfe737c471add364bf93fc0fde5e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=what+affects+boiling+point+of+compounds PDF link annotation
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b78e91a1a12ed018cdefc9aab80b7e45/teretilusobipukilikar.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99f2cd0f8a---xibukamememiromotufofe.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/kuravagebom.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/leu9itj3engk75e4nan790kgh7/52773358362.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/2d03b1c6877ec4cb1e66af4a64a971b3/pigowifefo.pdfIn PDF document text
    • http://kelvista.lt/images/files/fobunolivatok.pdfIn PDF document text
    • https://umartravel.com/files/29031797141.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609028eca7eee---53283741333.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/10326766236.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/jonubaxa.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/fakuvejevilarexatebije.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fec99191763---28604069349.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dc2cb8226215ab46d0faf2e83715b12/93895600860.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/38010680042.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1789696a---bonuxajul.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/869d967c30a8a90b4354a7e9a6fcae49/94667880510.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ubq13hl3jsq2k1js3habt3j942/89382104835.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/evsfo731kvl2hdpa439257lop7/musapavibitusaluki.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/nomumojusige.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9efde4a1edbafedca53e8466e1ccb958/12228735493.pdfIn PDF document text
    • https://manenshop.com/upload/files/80086748291.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/slrvud3v9k0hhqkvtugs6q6sgb/96807228024.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/samuxejemoganapunopusalo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bg5pv78mu6c0jga7herqhbbur3/89615775060.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e683c7aad---rajavetifamikefetuves.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/sqgddn32ugfp7q783k31t5n2c2/84269521682.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/8j3k2tug512lgtc6oitvk91t30/wewalaze.pdfIn PDF document text
    • 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_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11200 bytes
SHA-256: 2dc4322479f7694f36dbd4fb590059e68b38af3ee6bab2cab63993188f7bc84e
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 18412 bytes
SHA-256: 8814bdb44dce6c3186c68af7735667994a68bf6b6f9715c7d5fe29e2a487c83e

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