Malicious PDF — malware analysis report

Static analysis result for SHA-256 a856b9363411172d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 13:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e12f48c0629eca2817c69324f3737eb SHA-1: cc56ac67b8326903f0799804599f0ee9576131b4 SHA-256: a856b9363411172d3e79b81d101e5d5fc1e730dc5fb70c0ff21484b1d4695594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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://garglob.ru/uplcv?utm_term=derby+crash+4+unblocked PDF link annotation
    • http://laarakkers.com/ckfinder/userfiles/files/zarurenelufifel.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/44165808721.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c3960b7bdd7b62a50232d4a761afb99d/15729858774.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98a4a96c1---ripulujis.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/vegirokojomagamimijit.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/37355799089.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134bb2c0d987---64805560075.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/96597041087.pdfIn PDF document text
    • http://cortabellanews.com/userimages/lubabaxibomi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/49656699963.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17f3e5eb44517e02fe28b0250d2d702a/bojijobidizovawojolep.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/36215290536.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/kirugowulemugogib.pdfIn PDF document text
    • http://terminsk.by/pics/files/vagoj.pdfIn PDF document text
    • https://jss-moms.si/upload/File/reverebajexatede.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/redam.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/bufarexofukefelurigula.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/mivivor.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/nojudananefazipuneludaxuj.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/65434605931.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/18498255889.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusuvawanenegaseg.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/55661268735.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/delipa.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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 10804 bytes
SHA-256: ddf4422e9387981427d86af36efc34c1622d0b96569231cb1626bc5caa1a88b1
font_02_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 15408 bytes
SHA-256: 32f9c31f11c8c956fd6df85c2185ac268644ddcd535b2bcb77c86debbafe2c3d

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