Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc812fe1f990b714…

MALICIOUS

PDF

72.3 KB Created: 2021-09-10 05:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56c39ef0e31dd9186411535c2b261ac1 SHA-1: 9a94273cd3554b3904fed2eb15c93d7b24848c73 SHA-256: cc812fe1f990b714f3f578e806c3d06a7525c9aedaee6eede68c20dfd59f9894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs on potentially disposable hosting indicate a deliberate effort to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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 https://smidgel.ru/uplcv?utm_term=download+drive+for+speed+simulator+mod+apk PDF link annotation
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5fcae016a40034566ebfac18973db62c/62582645109.pdfIn PDF document text
    • http://unseretochter.ch/images/file/vozavotuliberiwefizatupox.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/remipivevamijikaxamujaruv.pdfIn PDF document text
    • https://southafricapools.com/contents/files/28551159045.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/24657523326.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84707980000.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/wariginoluvopibofuxifem.pdfIn PDF document text
    • https://istanajp.com/contents/files/tigevedalelogopuv.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/sujijurumowibajerakofutup.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/golovobusunoru.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/8901991718.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210904004515.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9a2f094394356ada17b8871b93dc93b8/kenopobawiwuj.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630494947.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76547217595.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/31509615292.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3to0k8ohavf1l9b1513tgmg61d/wotiv.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/totekufesuner.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/70776089041.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sizuxok.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0bc95olmkon6fsd8cb4b2a0p95/23523166595.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4fa5b49e8a2478dabe469a8da053f24f/43991629378.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/90f42473ff19469d84666adb446f0544/dujis.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/vopir.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/92814590587.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 11004 bytes
SHA-256: af5fc058f22b97ac49576f29e56c0f47b17d393d9253503eabeac2e18ecc73d7
font_01_sfnt_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 16468 bytes
SHA-256: e3a672af2572e042c93cfdbef70353aa546980dff6541f1fd42cdb11ed16f84d
font_02_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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