Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3d660dd3e37794…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 00:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75a7ebfb9fef5df031ed8bb0bb04a2b8 SHA-1: 5bda237642a3136c05a282f188e3f9251fa9cc73 SHA-256: 4f3d660dd3e37794258fa235daf95eccecd917f1cea744cee72630dd02df8bc6
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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=anti+money+laundering+act+2010+pakistan+pdf PDF link annotation
    • https://mauspro.net/upload/files/66858384413.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/09a1c566bbb478bbab39cc71d2dfc804/sutemaseji.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/90031410619.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/070b3ccc504c43ca9aec7f42a78a7a5f/rubaz.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/fegiduzuxegoxowuporalo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fba16b40203ab7a56cc4cc8242546857/28687427062.pdfIn PDF document text
    • http://dogable.de/userfiles/file/26693556508.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/17162962778.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab435725c27---mogopaj.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c93d4c33f782d818b318011946daa009/31658276271.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160800513b4e8a---26272687231.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3k68ckamum2kj088ljb36iag47/pasomakewuxujasujinuke.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jitarumogalatu.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/29380495831.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609858f422992---fopogefebu.pdfIn PDF document text
    • http://ellev.fr/upload/files/feton.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/142887a198f7f4dd563013fde44c3c20/majuganakuzumibe.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/surevidemijubusatuwuxazed.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nemovumajo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o6ql4fhoitoethoakvc7gvk095/pazavojodufenuluba.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bc41b4e0abc---36223083832.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u1mr8cgnj5h50b0a9fsn3dg0ha/52607734005.pdfIn PDF document text
    • http://zimmerei-possert.at/mogamipasub.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/md2nuq8v997b3co761lt3bj10h/rivawudamaguxalezitenuno.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6caaa6898f---genesutuwodegawipoxa.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_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16968 bytes
SHA-256: 3faabdee0cd06ca177cca9589dfaa1bc9ddf7a4429822f15be50fbcfb31f5786
font_01_sfnt_off00014cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB2 11544 bytes
SHA-256: 91f7beec91f8517bcb14c483e9351a6ca13cf600bed3a7cfbf66b65c5343766f
font_02_sfnt_off00016803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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