Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61b6fa09bb66583…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e134652b19bfb716e25fa6033477142 SHA-1: f3046643070a5263f2411437529ce9315a794bd5 SHA-256: b61b6fa09bb66583e7197c1220df07c64fc8ba9655cbce00f84a628fd9888dc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fe9c867db---63514893352.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139522c3f572---girabowotaketus.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ggj6bl24m67e5rsg8jm1b7vg47/75239485053.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/dunijotosesomilevuben.pdf
    • https://hobbypet.cz/files/file/39580741437.pdf
    • https://isosklo.cz/uploads/54651416159.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/tivabebujigeripizawu.pdf
    • http://dichvumucin.com/upload/ckupload/files/xoxosiju.pdf
    • https://burlingame.com/wysiwygfiles/file/somufug.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/28604246584.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/zulidaripawovoxaponoxosi.pdf
    • http://tzsunup.com/upload/84968079097.pdf
    • https://educhina.mn/editor/files/25422354680.pdf
    • http://321eastern-thailand.com/userfiles/files/kelumab.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5ae41a245fb1616ade9adfcf25bbdb03/22071630251.pdf
    • https://terrebleue.org/userfiles/file/zeboxagiwiviriseseribawi.pdf
    • http://acril.ru/ufiles/files/76876234053.pdf
    • http://phone-server.com/userfiles/file/bevixalijotemamirogigog.pdf
    • http://hueide.com/upload/files/viseduvamogejotozit.pdf
    • http://versobrokers.eu/userfiles/files/11819581021.pdf
    • https://thailonghoang.vn/upload/files/41291645271.pdf
    • http://mgtofubbq.com/uploads/files/37256047012.pdf
    • http://koppeika.ru/userfiles/file/tixuzoworubalavujaz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+host+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae47.bin
e5460a48aebeceaf5c997124612e789d7d672e81d0fd0543148bd6f0986f04fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 15628 bytes
font_01_sfnt_off0000d52a.bin
ffbde80c280ae529160106973870771524ae507d6133f02b6ff5633169ad574f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 10336 bytes
font_02_sfnt_off0000ecb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 16792 bytes