Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b1cdab3be2056f…

MALICIOUS

PDF

98.1 KB Created: 2021-08-16 08:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d17f69da9264e53a155a7b03ba275362 SHA-1: c2e36bcda71def4ccbec98d929728173139b0628 SHA-256: 49b1cdab3be2056f3d1804a1d045424e3097f9edde83d9438589873e403b0a04
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of these links and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4fed6c34d1a4bdc09d8898e74896d084/nenubiwamiboxud.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vih0178g4mvsekfmqvj4a610hv/zujojokapupabarawit.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/genixiralinalinenofififi.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/62727110055.pdfIn PDF document text
    • http://jarosi.hu/files/file/20745851605.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/22942656046.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/88817221505.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/11327869845.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pupiwe.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/6683955119.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/rususapusukulazijulejuz.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/lusumerapamowajurukin.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/84464776550.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a31b7074e---43459682617.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/54762519651.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/89911246054.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/99280217686.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/992b14257f055e7aeae72e5cf86706c1/70258905447.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/32803830159.pdfIn PDF document text
    • https://onlinendttraining.com/files/69187713845.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/kasifapivinidijor.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/87258946918.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608532a8f133e---83314596121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=yeh+rishta+kya+kehlata+hai+guitar+ringtone+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 10900 bytes
SHA-256: bbd25fd67ee5863f0c4dce1b1316010d02b4d8407a7392e339e5f91fdfad64b0
font_01_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 17476 bytes
SHA-256: 082f4e80d1bd208ce79988b8591695b28339f9e9cc5e34707b592d992a0fa739
font_02_sfnt_off00016191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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