Malicious PDF — malware analysis report

Static analysis result for SHA-256 8087a77609cbe6cc…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 15:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ee3023e27f9141de1dc9c1c00917db SHA-1: 335b378dd584d6eb244e0bb8edbc53aa7b8a9385 SHA-256: 8087a77609cbe6cc6009146b555f624c6e3e8935f397fad07798069dbb8078c6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://tort-art.ru/userfiles/file/88713498689.pdf
    • http://lycee-elm.org/userfiles/file/28077179991.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/54069c4921c1bfc3c96abf0bb4f7b1b6/jakofezufefasopodobit.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a95feda32---50146877800.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d54ce4892---48003612779.pdf
    • http://meble-tk.pl/userfiles/file/7378548966.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0357dc4451---tiketedake.pdf
    • http://orchid-daikanyama.com/userfiles/file/zapufipijijawusoguvaxiku.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/3de813a4048f028bbdc96d3726036562/jomesesutil.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/c261g7p143ftl4e01c1s41i1p8/7162649808.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b855829f7bb---89952597465.pdf
    • http://mxm-hosting.nl/img/editor/file/sedajipurovemokonefevex.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ef1f076b---sodid.pdf
    • https://itchanoi.vn/uploads/news_file/maloxofisixarevatavopoxe.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650ac27334---ripiralobo.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf74582673f---lubatonuxinoxamif.pdf
    • http://pantryscan.com/123cars/imagefck/file/40793629136.pdf
    • https://dock-levellers.com/upload/files/wotopabatanafejidarabet.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/99820527581.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kedelebovofuzek.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc218e218---nivunabuboju.pdf
    • http://dieta-plus.pl/userfiles/file/dadukaposejomuzutikumive.pdf
    • https://parfumzone.ro/files/file/34471820958.pdf
    • https://etonbio.com/newsLetters/images/file/xutiginolamuvaza.pdf
    • https://hotelmitrutarija.com/uploaded/files/pidawixasizofeb.pdf
    • https://thaiwoodengames.com/files/upload/files/6077805592.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/iomllv9e0p1jb3sgqi2i4u3mjt/2643416966.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=alameda+county+clerk+and+recorder
    • 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_off0000e22a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 16792 bytes
font_01_sfnt_off0000fa3c.bin
47a23fdb916e3fe5cc3e91c6db24f78d2c00fef7b14f30d0e66365b495d66fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 17788 bytes
font_02_sfnt_off000128fe.bin
d76e7a0670a63c07d6bcd3f8b905d07d8c70bfcf505f12554e5dd91546c966f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10560 bytes