Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98197c22903f379…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 12:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed407b41310a26b703860a93908ce25d SHA-1: c72c5f4fcdd7860558f9f05eff81dc4158d76b4a SHA-256: b98197c22903f379230c151ececcc0936b5b5c70153025fee1d89c7689d1bdef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8344c6244---40003613647.pdf In PDF document text
    • http://qlinairnv.be/userfiles/file/62791415721.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/59241683178.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6ae2aa0c2---68470846627.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/1656252834.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/40448038984.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/rezusopat.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021731234879556.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dea5hsaa97o6tn9f22m14v3hi6/81763329428.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062904443763.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kumep.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76b876558---tebidiwatenopizi.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/viwamafez.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56266802e---kogunibojebagapajepota.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/51042709172.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/35758355842.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/nupadekine.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/32792707513.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/gabomuvejet.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/723152b99d5a66241c8997714ade9b0e/zewafip.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2da3074bf---46841098756.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/58814238271.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce52281fa9---xozuwamar.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/012674ee5fa963bb6bc105a5165236f5/2121662569.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/gosizixulezonosexivem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pitney+bowes+franking+machine+dm60+manualPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d73f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD73F 16540 bytes
SHA-256: fc306beaa5b340e611fdc43a5832d489ba7cf393a5e4d416bbd2f680a25e986a
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 11744 bytes
SHA-256: c5cd60618edfd4cf9cd81054b182ac09543ff7bd5e630013afd2355b399bb156
font_02_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 18392 bytes
SHA-256: 4cbe390e5b6d2b64e59b231be8add71bd55978712cada7caf75453df4a8f286f
font_03_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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