Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5dd773f82eff53…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 20:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e277e14df971d841ad5fed0f22dfd242 SHA-1: 843dad03fb6f8c205e3e96fc34383be8da959e4e SHA-256: 5a5dd773f82eff53592f088bf1a813a6665388a2933e9e14a7e82b9add40fa58
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, which likely serve as a distribution point for further malicious content. The presence of numerous external URIs and link farm heuristics strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/86d624a97231383aa2d9c28bbbbbe614/dimanenufunigatudafurizu.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30bb3105f7---fiwugok.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/6jefv1tjj481partnubegb8772/zedavixoxuwubutozazam.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160740a45028f5---97863935842.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0d4fa4269f26a739e75c36369aa32bcf/fudokudibuzi.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071a86b1d0fd---moponuzen.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3fde1aeeab069c241ff430de7169a5d3/wojojawoxadujosiboxinogo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853139577---75871441358.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadbd2419db---vogezariwexutemasuzuxatav.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c2d713962e57fe20785a44e256ff9126/8556756537.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097b70799f3d---vejakejol.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160918298479b6---popizukalajarefavusonuk.pdf
    • http://gloucesterclassof81.com/clients/23558/File/pitojom.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608112b37f464---xowabavixapa.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/donokarijinezut.pdf
    • http://krevue.cz/UserFiles/File/luzoropogapijipud.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dcf61b749---74321091013.pdf
    • https://clumba-indoor.ru/files/files/77191275979.pdf
    • https://calmoinc.com/upload/editor/file/27726901764.pdf
    • http://gramercy-grand.ru/files/file/napekumomafunanam.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b7c126ed---bugokifumirumuwuboxig.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc0af55312---febalozapizirogaxotuxo.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/09ded373b7c3d0da05fea646a6f83f2e/sakujadug.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1bede6844---16313719673.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d59677ddf97bc37b3fcf02ba89d222da/66629711934.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcef3d3788---retojolepajutisuraju.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+write+on+paper+in+minecraft
    • 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_off0000f8b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 16792 bytes
font_01_sfnt_off000110cf.bin
221557fb50a934d411e1356e3655ed7137c1bcda2734a73be5ebf16cfb33d098
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 10504 bytes
font_02_sfnt_off000128ae.bin
c427b9cdb94d56cdcb769d120101e745809cee6e266ae9090f48c5c9a82e7f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AE 16392 bytes