Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2fec7e6345b867…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 10:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b78456c06631a6f8171bceb97dffb2f0 SHA-1: fc6f77a655f3d4b6ad8f78eaaa93b038740b751e SHA-256: de2fec7e6345b86784ca89fa717589b878b49a4734968fdc40ce2a26178f289e
164 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of urgency language further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=robux+promo+codes+list+2020 PDF link annotation
    • http://indigobaby.eu/upload/files/jenedawuxubumedo.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/54255662377.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393d6debf14---91009618863.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34820184274.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/96590234645.pdfIn PDF document text
    • http://hidramaco.com/files/files/wajosaxijob.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/faxefigipe.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/mobuniwipitazuleminubib.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/lukezusoninaguke.pdfIn PDF document text
    • http://kaies.net/upfiles/file/49293348299.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138f504f394c---85630493167.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/23580833692.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1d2b85595---kurunakoxerax.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/sufijerawokobasuvenabusa.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210902042944_1879349106.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/zoxixulopexagixuderezam.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/mezatugovanifebozupo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b0f409954acdbf2ff096efd80ad9f3cb/50402671730.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d173d764---13231930468.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/903e1ebp8er2vutetpefaqklhb/3303687940.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/1576340087.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/36973042165.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fivotusomatavesev.pdfIn PDF document text
    • https://tmtteks.com/files/zojeguresoredinuvurekiz.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/69915003848.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 11036 bytes
SHA-256: 4e0435f001aead2c76c710e1aac897532f214959307ad1efbfd4beddae914329
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 18300 bytes
SHA-256: 561e7f5073d6fd308192a9bd72497346dc355b398346a0aa57a0c3415e608ca4