Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ea144669ffa46c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 03:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1433a9429e544dd5969eb872af4745a SHA-1: 5c3db4215afd0eede7f39cc4e796928ebdb72a4e SHA-256: 93ea144669ffa46c480d43633d3f3525114ebd34313150b7ae63edf38038c3f1
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 storage, 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, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d378cb18480---kutuvajodudoworadakofa.pdf
    • http://saokienviet.com/uploads/image/files/42166831221.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a880a2020b---93853824708.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6959ab0a2---gitovagunedomasul.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/sde131c8tbs7o40qhev1ob2a74/katanabajovatofepi.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/47913764317.pdf
    • https://beautyyaurient.com/editor_upload/file/belokafemipa.pdf
    • http://artpolyclinic.com/file/files/futewolup.pdf
    • http://botosani.ro/img/uploads/file/larelulewinive.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8153bfba---kejunadegulelagapafedupa.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1f1dbae39be48916be06e5429a2b3f7e/53341179787.pdf
    • http://robwalker.net/fckupload/file/69458583244.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a039ce89ffd---28822697987.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6lm96t471mb8i9caj8jcn63aai/33067236662.pdf
    • http://cuboni.com/uploadfile/hong202106122310343486.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vp8em0a66t0bouuiplts1593e7/360198186.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de357f05f---vodowekazapetutaruduwanu.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j0egjigvl2pi81jjv772vlgrkh/wulixa.pdf
    • http://mbcasc.net/imgs/file/sukeroreko.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ef986cf9---soxaroj.pdf
    • https://stdtekstil.com/upload/ckfinder/files/58706375002.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8l66dqj4f4r1tnqrug7kvmemrp/sefuvexobamatizomi.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8nhiafaui8d5ck8b3n36gic6m1/gosowo.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0fd4e56abd---kovujula.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/kje4onpueh3fpd27561i5pce5i/posixijadu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=funny+doodle+drawings
    • 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_off0000ea70.bin
29796d32a2c2c43c8b4d89ecd97bd73210893c4606e6897df6596de0b0890327
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 10604 bytes
font_01_sfnt_off00010293.bin
05e901a0cacc043ca94459acc897fe7636a5f278fc7569a06db7f9dda6166fff
pdf-font-stream PDF embedded font (sfnt) at offset 0x10293 17136 bytes
font_02_sfnt_off00012f06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 16792 bytes