Malicious PDF — malware analysis report

Static analysis result for SHA-256 b451b98ae4925272…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 04:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eda055e482aceb66357b3a313eac1017 SHA-1: 4421697cc90be5d6f1091f717a028e90e368ca58 SHA-256: b451b98ae492527214cad51292a1319f6726037cd0186a682238eefa566f1a0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable domains or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saunadlaciebie.pl/userfiles/file/wokojinula.pdf In PDF document text
    • http://thumpamonpally.com/userfiles/file/xutobizapegazetikugepopat.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/jajopaje.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/3082961545.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/tuvonopolosigesuromenuba.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/94039324043.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/38619262735.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/geukj41hcuq7ut7orr0ne2ef3s/52899362114.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109190154029023.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bofapa.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/83260273135.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/10037517133.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/9187944571.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/6583483183.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/46347362331.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39787359349.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4fdca0a1857fabc2e2563de676d2b49f/purejegewamugufuraxuzufi.pdfIn PDF document text
    • https://tsegypt.com/file/43975130653.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32817095a---42454028724.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/55201978692.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/72243788086.pdfIn PDF document text
    • https://tsegypt.com/file/84551500431.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/57534722879.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/2350207033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=private+instagram+photos+viewer+apkPDF 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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 18008 bytes
SHA-256: 4e2fdecc9003de81859e5adfd2f947db214df4fd648bd347909f2b9f6b2dc58b
font_01_sfnt_off0000e34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 10900 bytes
SHA-256: 2d94fa891b4652875695cfed2d461a8e554074445590a3d9ab9a9f158a8deec4
font_02_sfnt_off0000fc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1