Malicious PDF — malware analysis report

Static analysis result for SHA-256 251067aebd6aa7bd…

MALICIOUS

PDF

78.2 KB Created: 2021-07-29 18:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 563e044591902cf1417f3114f092a8c0 SHA-1: c37a6e453cba67cde34da94265eb1c68d273ff9f SHA-256: 251067aebd6aa7bdb014c9ec1090f09ef4cec136b2899333564e7874b7f7b06a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the structure suggests a link farm designed to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mvpartners.be/images/uploadedimages/file/mogofubufilizela.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c27a20fea---25498535082.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/rudezaxinokopopeduzajome.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ce35a02b64252668bc83254cb124377d/12604366389.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc190b81b---85471349669.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d9349edebfb426dc7bd3cd575c1a0037/nonin.pdf
    • https://jahanchart.ir/data/files/file/puxukulepevasopiditexi.pdf
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/rewibokibuser.pdf
    • http://fszhenjia.com/upfolder/e/files/20210602202438.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/mefakovakovowe.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1669aa75cb92e8919bbccc2460ffbf45/47767197236.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1e74304b014e7d4ea75a00d7d972a689/mifit.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/45707662605.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/bd9295c4a28538ca6d2c808dc3256e0d/nefiburisufo.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a210bba435a---fedeleviruf.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161027a6fb9fa2---zovutizolowuzotixomunis.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/11152447529.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/1019c2ceb3a062f1c68a4d35e4cd20de/gerux.pdf
    • https://ipic.vn/userfiles/file/jidanorebawonenugitezel.pdf
    • http://kidsjeodo.com/images/files/pifudazutoguru.pdf
    • http://crmloccitanecr.com/campannas/file/75257035772.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083bee7e454d---24388729881.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/28cf8b3163b273c87e6dec88060e6fb3/diripak.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0911faa84c---gatuborativisivu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+fire+red+v1+0+rom+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_off0000ce3e.bin
9cb10e7b104bd0ab69e1cabe1b0f062a7fb655c5a413adaf5148734376d20e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16976 bytes
font_01_sfnt_off0000fa61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
font_02_sfnt_off00011278.bin
7138dfbeea3b4ab43f7ec9aefa2100dc2ac1497cc53bea1de1974e3ec6b60f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 10668 bytes