Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c269a3260421cec…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 06:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5b45ed3fa8dc573aa5d7a9fceb3cc1a SHA-1: 45e23c634680b8ea1af5681b90ad30c6aed3ee60 SHA-256: 5c269a3260421cecc0c2ac959a3e541342790d01fc20fd290f8a3ffdfa96a88d
156 Risk Score

Malware Insights

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

The PDF document contains a high density of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=android+app+to+make+ringtones PDF link annotation
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/6236507145.pdfIn PDF document text
    • http://tzsunup.com/upload/giwanoxap.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1936237896136b75688696.pdfIn PDF document text
    • http://hoachattn.com/image/files/warebedobewarisegivujipip.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/mixupejakabawobororo.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/lumesus.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/094ecfc7bd3a3cdf48acf488cb6a22c9/21904501145.pdfIn PDF document text
    • https://ahha.az/userfiles/file/lazosom.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gewasewigawawif.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913161025632252.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/dojoxiz.pdfIn PDF document text
    • http://gestioniarmatoriali.it/67552373192.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wojipipo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/13074901575.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/ramoxa.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/benubosipupadelafugoravos.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210910163707.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/wutilovexib.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/15955993105.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109032002337090.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908002624.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/94518131711.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613841ecc6009---xolifit.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_off0000be3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10764 bytes
SHA-256: 673f464ceedede61964dbdcdfa398c56cb544c4648beb24f81e6b5ea42ca03a5
font_02_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 18456 bytes
SHA-256: b1adb62e61239891bd107706c6322a19e66a7e6d16440c709c76d200f6319f0d

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