Malicious PDF — malware analysis report

Static analysis result for SHA-256 db142c869061ca70…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 06:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfc617a1641feab4d65c8c3a54bade92 SHA-1: 419e32db652951eb20b796f337ba6702cdfb2469 SHA-256: db142c869061ca70350dfdb228b755ecfc56c37d9d0cfc532ed8b7127df2b280
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised websites or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of numerous external URIs and link farm indicators strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=the+conjuring+movie+tamil PDF link annotation
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22268707744.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/zovitonuzazisefonofu.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/26012377082.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a3f608e4f2c57bd20fd8cc2e58b55915/14493451571.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ogakoq1a0pvlbp0m612juno934/kotagunadufofonogese.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tusolizadiwaxexo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/deda17edee16949e76837c85330afc22/36499416756.pdfIn PDF document text
    • http://centronegozi.com/public/zanepinefidenu.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/tufiduxunowufopowewepi.pdfIn PDF document text
    • https://izometal.net/mm/file/tomuxazobowoxekiwu.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/ferosakixadu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7887dcb02---34965089497.pdfIn PDF document text
    • http://rideco.hu/upload/file/21007340842.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a459f2dc3---zevimufov.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/92293194118.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/29442120170.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tewatobod.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/sefilugojubebes.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/27423983441.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/wexoweminirupin.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/mavobedaban.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/360ae84286be283bd524bde7ce2f9405/fupijotogaderemodikomud.pdfIn PDF document text
    • http://billsky.ee/files/file/6038571084.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/tapobijavaxokufepixatodap.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/fikotijusimepolujiv.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 10768 bytes
SHA-256: 2e358d011aa56750469367ea146809f3320b177b912e33e34bb2bb441382f2a9
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 18040 bytes
SHA-256: 3647268d03831cae8d0e362a936204e980bb36ea23153be4401e72ff913bd8c0
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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