Malicious PDF — malware analysis report

Static analysis result for SHA-256 991a30f80a9885d4…

MALICIOUS

PDF

80.3 KB Created: 2021-07-02 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a97fdecb437adb2e44ffd60d4fc48b97 SHA-1: 2c79fe23e30cc7b5620cb0ac0d668497c196d2b1 SHA-256: 991a30f80a9885d44fe647fe6290aa664916bf79fa3f84a417b9fb8d78399819
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/48f13118251c492685cde515c561caa1/binotazivoxenopeg.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/madomuweji.pdf
    • http://nicenpos.com/userData/board/file/22806277964.pdf
    • http://pspectr.ru/userfiles/file/99592511412.pdf
    • http://ambulanceservice.pl/userfiles/file/vupapaku.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f7ce5596d---82856375178.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31f7697c9---pamomuduzonaso.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ed3c40ao8id6e7k0t23d9klhg4/lixotu.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/q1hlu2re47d7iid379trhjhpp6/mapulobigenejuteto.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5fb2eabb9c7fec6769ad65d714e3b76/3688379276.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/fb3a51e1acd77a752c0dd334c779b06c/mopuzutatetamemoruru.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/baad1547ae45215ca491e0cac99ef650/43564747794.pdf
    • http://lycee-elm.org/userfiles/file/sunulawokajekirugojototev.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/6ba8d12dbd434a2e2b5c4a9679514b78/vetefijajopikuzigoma.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5a9a750c---77101659301.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1b2d6215---letawetafakop.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b54d4609---lewosufowis.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/i22u7n28403d1aebo4dkg4iol3/naluj.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d002c488---75303427915.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/25182335988.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0946f272d7c95c58310c1d3fe2bece80/wirodanu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=delirium+tremens+from+alcohol+withdrawal
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000dcc8.bin
25d4830a7e340e4959ac48d9137d9d1b9980d28faf26e9aba3c308df9d2d7a89
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 16808 bytes
font_01_sfnt_off0001089a.bin
4ac9faacff965642fdac70592f1c6739bc8c876bec63ca66d9d7b3e53fa5b103
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10928 bytes
font_02_sfnt_off000121ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 16792 bytes