Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfdb0225093df53…

MALICIOUS

PDF

95.4 KB Created: 2021-07-22 05:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27f4248f9556e16575f6617abf3876df SHA-1: 22f8b191cd72874ae550331425a44d40da302def SHA-256: 7cfdb0225093df5393990c80cd7071fcebbffde5957b8513dd78f1644ee58afc
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 hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/acad2380d15f6050fc965d8f980f11a2/gezigunidikijiluxa.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f90c7caf0---6364795922.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/87cebc26822f4f77b153817099e92a55/kubatubuzeviretarakogid.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/so85gc6fs8savn6ngl68r63c3i/gulubojoralaki.pdf
    • http://camel-republic.com/media/userfiles/files/fovusutolu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l7iieqg132u61t8q98s87aofb2/36444112325.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abce426514e---bumuvedegakujazul.pdf
    • http://www.companyforte.com/imagenes/editor/file/56400517008.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/73156463623.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/xudamutajenemeb.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/80f4e9760b39234a9ae805a8468cd715/pixakokixadowuvunamuvom.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fcbb0a5b---refevanimupaniz.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31e7355de---5202911329.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2c68664d9---46656687793.pdf
    • https://turismoporsantander.com/aym_image/files/79684091637.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8a0a4fb3---fokifenumatabemil.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9a1e8e8e---58226942771.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/aeae20ab04e43c83e5f58b113e768678/fatenazixexipikeburom.pdf
    • http://forter.vn/hinhanh/file/gebawutiwupovu.pdf
    • http://acecaalcoy.com/userfiles/file/makoderejotelafugel.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/232216209260aa9a2c581779cd41be39/pasujuxeludafone.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/2dc5563c8f467efa03d57418ee609ed1/gupexajeruso.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/0n15uddua165dqn1ju71p1tf3k/titaliwejuxuj.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/r41ftr5rvs9htiobe7uv6p4aqt/67599517580.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210706003229.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d662443bb23---safitiramizujagi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mass+effect+2+insanity+guide
    • 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_off00010fcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 16792 bytes
font_01_sfnt_off000127e1.bin
492f981371db85d6c6d6dfcd4815a633cacb786257aaa7166692640971e8c4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 17696 bytes
font_02_sfnt_off00015565.bin
1a789f880f310ce0b0da439fedd8229ae7552958dd9bebc2a4357b703baed0da
pdf-font-stream PDF embedded font (sfnt) at offset 0x15565 10712 bytes