Malicious PDF — malware analysis report

Static analysis result for SHA-256 6980b04b6421dd17…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 15:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 125c190e66428d278cdb918dd36bcc54 SHA-1: 34db12506d2b7ef7e6f589b2c8ccbb5603c99703 SHA-256: 6980b04b6421dd17d2b0d7e6f4a18b9e39cf8822e7764f4e4e85d78bbf03b21b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=kitkat+icon+pack+apk PDF link annotation
    • http://vladjurnalist.ru/archive/file/35404668193.pdfIn PDF document text
    • http://billsky.ee/files/file/dazefufezud.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/jupivuwo.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/pilupufomefataxu.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/videwaloronixigene.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/32615321207.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/72660091445.pdfIn PDF document text
    • https://pcetravel.com/files/file/pivuri.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/mosud.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/51790966050.pdfIn PDF document text
    • http://kant21.com/userData/board/file/24618031502.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/tagujuboz.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904211242.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1843b744a3adfe1fa77f080ea973c7e7/72529894281.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/modopuzafiz.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/dodab.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/zefebim.pdfIn PDF document text
    • http://24cvety.ru/upload/files/91017148223.pdfIn PDF document text
    • http://irths.com/upload_files/files/89259860664.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161354e7290205---77172091557.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/89399327054.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/48e0b5af05b220d9585ebb9047915fad/28209239457.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/vajodufedelinewagitudugi.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_off0000ce54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 17392 bytes
SHA-256: eff3ff700dbc7936265d08d18d5f9e626df64cc177f2842a98a5fd893b4cd019
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 10004 bytes
SHA-256: 31edd90107f504920f8fb0ae48a38f414f3fd24357196fbb83a942411178c54a