Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e6147bc2c0313c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 16:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9962cf9f9e082db5596b12d10b2fa7 SHA-1: f6074daeca2e83aea847d9b07814bf56885e7004 SHA-256: 91e6147bc2c0313ca14a44c284b5b04130184017df5d1f823009505cd25a225e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607113c65a7df---90957895283.pdf
    • http://okulsanmalatya.com/imgup/file/17603907157.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608243bcb7f3f---33868324655.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/baf37f16b01c8ae3720432abbd25cc34/garexiwapodo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f459455417---85570337221.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2fq9sqch713amkpiclv9rgl6s0/vemotobozamujopu.pdf
    • http://www.firengo.com/userfiles/files/sapikujarop.pdf
    • http://prime-standard.com/piceditor/file/soloporanojuvi.pdf
    • http://scro.ru/pic/file/nagibowupopura.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cba06edba881e1063e081733249df4eb/76355504776.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5679a91ff1---60895805444.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/20398634539.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tepaxajusenamunodu.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607a025402404---lagetonepuve.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c413d05d---vijixuziz.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd7777675---41832810846.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/kegavitesowe.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2kfctal279cukplth2e9jsoalq/monetepijekuzi.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1fj0247136odeljc8lhvttedak/24460389803.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c389a413954f58f1ee4a492db3eb08b6/73087473266.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732a083bff---tujisupuxazewejisiva.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3787895b1c5caf7a8a240b4d8b30a99a/lukuruzela.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b8cf5e2d29627caf866fb147796d0160/lipolovo.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-10/20210510163846494231.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zack+saved+by+the+bell
    • 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_off0000f061.bin
da2494686db6d44b4f2e5d007c9d586aa71d9aedb37dedc3093a0f4f2936f2df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 18620 bytes
font_01_sfnt_off00012038.bin
ac96b3db47d74afb4122fa9d50939fd13aa009d17b895c2140a152382f2aacf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 10424 bytes
font_02_sfnt_off0001381d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes