Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9d4c5f74f369dc…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 18:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e3ac4e37d2e03817fa361c72b2e3c69 SHA-1: 753d85e6cfedae45632ceb6a78b32a4783073361 SHA-256: 2a9d4c5f74f369dce8d865c1047b4b73ae68309b3dfaed9578eb1b77c79f4f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b0084b6---47240298823.pdf In PDF document text
    • http://fullx.net/files/kewefi.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/kededumamowafek.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/48574035160.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073af0ec607a---sizikuden.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7l29i2b5b8odgjlahv27isgcj0/nusabixe.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zimiduzetavakowavixibafeb.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33e41d77b3---riguwifixulajawaravaxiz.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/vavurozumofag.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/tunowofevitikiwigexi.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/82371779255.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/6920308419.pdfIn PDF document text
    • https://atl-50.com/files/file/zubogum.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb961f1823b---nitotanajunajobogafa.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/64823069097.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/65147084157.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/60626756120.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c43a95a70b818a4cce5bcc7ab0d05fd1/dasaxutozisusemewapeva.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43edea1fd1---vawobibavovujexe.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/fd97d3448c18bfd8f0016e22a47fe841/38394714379.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160caaba005cd2---wawejaxepefanonamokevan.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608231f14743b---48503198562.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xunepinamatem.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/jowig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+way+to+cook+a+hot+dog+insidePDF 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_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 16820 bytes
SHA-256: d100602c48ed5e26ff3e576907a1dfb15c9310b3b4fae5e0a98c696725cf5246
font_01_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10848 bytes
SHA-256: e289edd0def93457007c985b6310c69ed8fa8c6ba7af4b7c8b96eb1aa1fa0f16
font_02_sfnt_off00013585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1