Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a2481bfd13da6c…

MALICIOUS

PDF

75.0 KB Created: 2021-07-05 03:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49f152543811d0883d57bb71537b1a05 SHA-1: 7098ccf0c84941f8c36aa8afc6ec9876857224b2 SHA-256: 57a2481bfd13da6ce635c2f0dc1268e3b7e2c3fc73b9a196cf0d7a6a4fb41e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/020dccc6f8fed958f1fa591c7ceadfd4/15986402697.pdf
    • https://balajitutorial.com/admin/userfiles/file/dawovotogegiluladurivexi.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086d5cb45cea---47747766635.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa5b88461---4378593190.pdf
    • https://aravlicraft.com/cmsCart//upload/file/33779307281.pdf
    • https://alakharia.com/public_html/userfiles/file/16066513152.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b338e9e4aa20eb3250930d626f9fdcc0/burisawaxifukifu.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b29e05ac---984527739.pdf
    • http://woodbridgeabw.com/uploads/files/nixataxexulu.pdf
    • https://muratay.nl/userfiles/file/muvepikugonopu.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6orgga87t0aqscs158tg45mci6/97143761535.pdf
    • http://davidhammerstein.org/userfiles/file/kibizijopetilatali.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1b1ff69c20fdd870db3549482249cf02/10222772922.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a964fc6807b---29078668297.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/wudodoli.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f5402df674f8c9c4ee602a825e09d652/jidinarigemafijupavu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f23d2b9b---13124552488.pdf
    • https://fwullong.com/upfiles/editor/files/xinemeguzakosexofuna.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c61e6f97e---57887952467.pdf
    • https://alternativecarrepair.com/userfiles/file/lovewexok.pdf
    • http://haithuanphat.com/uploads/files/kipegida.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a185679c517---kadoxuziwigebot.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/pcsvf58ggivlv71t3p4i0mbume/68556659419.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kenya+sessional+paper+no+10+of+1965
    • 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_off0000c1dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 16792 bytes
font_01_sfnt_off0000d9f4.bin
83f80b4e22356b0107f142f20eaf7acd72b8ea467581a02e0232ac2da9ef188c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 11000 bytes
font_02_sfnt_off0000f3a7.bin
f4620ae76cae366888d79161c6a64ed41af1b9c559d73caeee4ef4df8a4e1ab8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16544 bytes