Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5487e275549510c…

MALICIOUS

PDF

167.1 KB Created: 2021-07-03 23:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e30627b95abea018c73b10ec3872e5b SHA-1: 29358ba13c0439cb1ca8561cce6b737e6e5c225e SHA-256: d5487e275549510c2582b96440bcd819df140f031c71686622f10a0df71830df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m7dt93a5fclh85paat02abp8bh/10863305973.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/wipepadaxojowij.pdf
    • http://strahovka66.ru/userfiles/file/godetovosagelab.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099acdf86e17---zaramazoku.pdf
    • http://trustarshida.co/cache/fck_files/file/binadifaxo.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1d9vh8be5556rf86g9g6tbd5h2/jipebugisike.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838028e416e---49036945450.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6f67e100e9a1afe565896123063aa01b/zujol.pdf
    • http://reguitti-engineering.it/userfiles/files/buzefapodoselomupax.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/mfhibrft219ije3l9uh9flh67v/kisajuderoz.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfd53ef81---90219047068.pdf
    • http://mulroyenvironmental.ie/userfiles/file/90612137531.pdf
    • http://bantinnhadat.com/users/files/41778676256.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbac18c9140---wanezidud.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076e8fb07e5e---3963257202.pdf
    • https://koncnc.com/genelresimler/file/31820216779.pdf
    • https://aduanaldelvalle.com/userfiles/file/7110379639.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5f82fb5050d634ca5e7fd0db61b61ea8/lunukosidijipadinedexib.pdf
    • http://akcjonariusz.com/UserFiles/file/merobodekomikud.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/930740f4db057650859f772b5d93d28a/59014840422.pdf
    • http://asja-doll.ru/userfiles/file/97888510781.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823abfebeb6---pejolopuvuv.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h6pnp0kqa0t0q7vv4c96tl4dsc/penodomezamigile.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b8f6f390500ace0167b58ba6d5ad9d44/3151261111.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cf33e7119babe6f05ecc52b438abe6e5/2689878016.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=put+the+verbs+in+brackets+into+the+correct+form+of+the+past+simple
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/18047b42f6e32ec2e8131fb4f3933170/bezegadifalutajos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000208b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x208B7 16792 bytes
font_01_sfnt_off000220c8.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x220C8 16060 bytes
font_02_sfnt_off000235dc.bin
6ce465ab7acb06e8816ad923c02fd9f3ae4ad3116945e97122b117ae353b1db8
pdf-font-stream PDF embedded font (sfnt) at offset 0x235DC 11144 bytes
font_03_sfnt_off00024f8b.bin
8b04726bddaad7450c2c095110cbd040300a1fcdd3185b74060b6ab39cdb1a16
pdf-font-stream PDF embedded font (sfnt) at offset 0x24F8B 24620 bytes