Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8a3d007d4925df…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 06:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5bc1a72d8e52347512ecb4d6f03da5a SHA-1: 1ef4f5ec3bd05a30eea2b1aae5cf545e8f17df44 SHA-256: 0a8a3d007d4925df7c213f6c670d1f1fb9f970cdbe300a382c15f276f02f5a43
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document is image-heavy with an action trigger, a common tactic for phishing. No scripts were extracted, but the presence of many external links and the overall structure strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://sghscsjamarai.org/guruhargobind/userfiles/file/komigabofudevo.pdf In PDF document text
    • http://autoscuolavalerio.it/userfiles/files/10549281946.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/48166009559.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bde6e4628b---tedusurofonipibe.pdfIn PDF document text
    • https://aaaxxion.info/images/file/deguma.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/jadazemapodovu.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/95931064873.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090307504628.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xenupotumunibifasalilatef.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/dizokexelodu.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/mobodabowosudiduxamux.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/guxuruwapavakem.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475dcc53f13---54077587524.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc4f4a7315---84217909811.pdfIn PDF document text
    • http://friulanapanini.com/images/file/1234178340.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/42029459337.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13859181392.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/bibebizavo.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/45301585584.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/18694576081.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/72712492042.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/91283571402.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d75d501c---20904608511.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613343caf2cca---fovuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bypass+private+instagramPDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 14100 bytes
SHA-256: 23c66fc66c273ef6793e712c6315443dd0402717cb50f3cd82b959229736c766
font_01_sfnt_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 10660 bytes
SHA-256: c00e5fa7f52ef29437e97e552a9bb4626fdf3d31edeacd9da1367dc35b91c07d

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