Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ef37c8e394145…

MALICIOUS

PDF

88.0 KB Created: 2021-09-07 13:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a3aceb90aa297cf5c368267f78e112c SHA-1: 95dd78fde01ed3598feb9da014b997e496047007 SHA-256: 358ef37c8e394145679d4fb237030fc359a0b5af414b45ca62525b013486a259
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=osmo+pocket+wireless+module+manual PDF link annotation
    • https://atasuorganiktarim.com/upload/ckfinder/files/62773440831.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773ecea2f0d---23432248917.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dupej.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161032b927c27d---miradudamajizuzidaxaj.pdfIn PDF document text
    • http://stroi-sistema.ru/img/28182759244.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/257678160bbb1d5e59e0.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/db23332e9d4a1dd866c911bdc22b2114/49306000490.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ce063d77a584d078a5086eb4fac85035/63213170902.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/g4r9tv30kflsp13u70s8emjk1o/mejupewegezakaliganuza.pdfIn PDF document text
    • https://masihpt2.com/contents/files/mugajidaxazeju.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/9b2465fdcf1dd7ef429e7663a932b3bd/853878439.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/da0bf5e7d1c472e65e09ae4c1bb7179c/76421198737.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/55214857748.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096430e1fc73---96281109089.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sarelixukidize.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210703_868482A9CA95A5F1.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/pilinofosowenupo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f9125e79016f9ba321ef96328afe6b0f/87755386075.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/777bf8a68b2a76ef0a88f328a984a37e/90639252834.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/96432665981.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/wulurifuw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 10976 bytes
SHA-256: 2061d93e22b136d41260f30cb12ea8ffefdd151a8e7e60bfb8e332211f48f925
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 21632 bytes
SHA-256: 7973e0f4161725620c96bb220bf6efbe8730be613a8ad110a75e3b55c4edb6ed
font_02_sfnt_off00013add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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