Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e528f61883c225…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 16:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd17eaa99705f1297a81569f9bbbe350 SHA-1: cc4dfd2e879c7203068d9a040892d1dc3a2e3fef SHA-256: f2e528f61883c22512fbd899a40521d5372d9693b119446d9c5757d6f3f5b9f4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://giaiphapthietke.vn/media/file/files/tamezivebumuma.pdf
    • http://vallovin.it/userfiles/files/99863672262.pdf
    • https://fjhi.org/userfiles/file/tibilul.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae3527f05---97798441665.pdf
    • https://lordoptika.hu/files/files/34111913651.pdf
    • http://effekt-film.de/files/file/sepozul.pdf
    • https://drproperty.in/userfiles/file/gugeko.pdf
    • https://binhvi.com/upload/files/firiboxolozik.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16136d51d549ea---68174390669.pdf
    • http://lngpetro.com/userfiles/file/zepogoxadezozalenixuxo.pdf
    • https://turkuazhost.com/calisma2/files/uploads/jikero.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/nimegitokozeba.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/31586345760.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/midalelupaguradipiwi.pdf
    • http://inlovehuahin.com/file_media/file_image/file/nerijizisumotej.pdf
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/juxojefij.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146a3d47310c---mitafasogodoj.pdf
    • http://tinhotsaigon.com/uploads/files/wokufididaduxibib.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414238710e7---82058426962.pdf
    • http://letresorellebio.it/userfiles/files/20221087063.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/zabitefijajuna.pdf
    • http://kedehg.com/ckfinder/userfiles/files/pajomotojibuz.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/61671301886.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gta+5+android+real+download
    • 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_off0000afe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE2 16792 bytes
font_01_sfnt_off0000c7f4.bin
08790b8bc18c43b2879aecaf75834b402f2f9e2d327b86edd104d7dfb2f2296c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F4 14532 bytes
font_02_sfnt_off0000ec9b.bin
70c0326931ba378e76ff749acd7333339db9446eb7757025559ae85c149938fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 10332 bytes