Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ab561c9c61c09d…

MALICIOUS

PDF

98.5 KB Created: 2021-07-17 08:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 174f689074773a360a5dd5934599bca8 SHA-1: 0125aff197e096cbb60ac629c642bce69ee643e0 SHA-256: 56ab561c9c61c09ddbfe5b7b551d3e42d71431bb313d71cf024149e818dcc006
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bb85e4b60---tomikataw.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfe30f244---fifasetara.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3432f07ba---88488301594.pdf
    • https://avvocatoboretti.com/file/jupamoda.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/82f3818856bfdab5a86a74aa0a9f22f3/49455618081.pdf
    • http://lulanjina.net/upload/files/wavizazuje.pdf
    • http://hysansam.com/fckeditor/userfiles/image/jivuxegetojewuniwa.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219ef16f25---7676101102.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/sepisemelazelekisevo.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/xivijuwutulogipivutasid.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/q45iul72uqnoq70s8dbm158m63/xiwekofowazupurazifamosu.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikekasimoranekogu.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df4893d8089---gazapinabuziwek.pdf
    • http://aaaexpressheating.com/userfiles/file/14593134464.pdf
    • http://schodylux.pl/userfiles/file/64457913874.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608afbcb1c097---68095687414.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f5dqcfcs5u30skoq5ot1uphpe3/banut.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae4b354123---49393607953.pdf
    • http://energo-winstal.pl/userfiles/file/vejigumukolijoxu.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rlavvu9fj9c27f3du2ba9hjoi2/gezapoxowakamubori.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/mijalo.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/64244631672.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5a13907b---33104194612.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca76f0accd---ritixawagamogila.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chemical+engineering+project+pdf
    • 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_off00011ec4.bin
bea1cb414059af39f9dc34907289f9baa501b7420522c3150f2de1113377c59e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 11060 bytes
font_01_sfnt_off00013817.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 16792 bytes
font_02_sfnt_off00015029.bin
8bcf6986c23dba7fc6d658f90729942ddaef7e6c86d1fd2115600b5791398388
pdf-font-stream PDF embedded font (sfnt) at offset 0x15029 17024 bytes