Malicious PDF — malware analysis report

Static analysis result for SHA-256 281d038c047eb684…

MALICIOUS

PDF

92.3 KB Created: 2021-07-16 16:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc4c9c9578b78512e5bb502c2d1a8524 SHA-1: 934e6af8e7a191218ed8998750cb45038dbfa393 SHA-256: 281d038c047eb6844d25e8a9fdb5073bdf8f87b11d7967bc096c4b0af4996625
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request to entice users. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19210acc22---vufalimibamabisikenotefa.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7b14e003---dazaziliderevafofer.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-6/20210606135557326119.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/sonipijodaz.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/463a1f8aed06bfd3ac890c4010e37211/80063298813.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/n1veidv81276jfnp49rpk1lbav/pufuki.pdfIn PDF document text
    • https://miet.hu/kepek/lamabenasudowedegeraredex.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zubipodofebimidegamo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eb641b53---balumevenolumikusepaf.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7faf0314---baduxubebezotuvo.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/13904019261.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xebupebigegirozukawebaw.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lafezeg.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ba865f0e7b2---liligijisejediwamadu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b0a50605c4238882df0eb922acf7d2fb/64805799826.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608006dec746a---netowuposufolajifolu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a8269ae4117fa656db29b36c0749665a/jagizaworajeposu.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6407845b---73262974889.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s1mv5mplaj0cbqkf95ktcgj9s0/vevadusarujevepeputalobu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b9409a43a---wipavutapesefulawekow.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/58635386433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=accounting+information+systems+controls+and+processes+2nd+edition+pdf+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 11276 bytes
SHA-256: 51f285931eb14af3510e26eb72b3090629d2223a0123d9a703293e54c456881a
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 2396 bytes
SHA-256: b56a1f7fe91c6040066ff09d04d0534dda708e0fa3c75d40eaf2e3bc9c7b7d14
font_03_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 17156 bytes
SHA-256: 0b807db6865756c5cc502086f822a7a0e7e715ac9f55bf3ef0ab16d2df485afe

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