Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc39cb0f175a71fc…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 03:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bedf710632c3a193bc097c21ff107542 SHA-1: dfe57e3f0fee253295dc4276a1ae5dab6eb07997 SHA-256: bc39cb0f175a71fc899dc1e93ebe583572d7a1bd93cf39a4fbc7abc459e25065
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting a phishing or redirection scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=sender+ramps+manual+master PDF link annotation
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/fa179304d2320be0880ba137fac4fbbb/90679782109.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vid1sqsjts8nf848q5qvbk11l0/37746082556.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/mitura.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/tuguludutabob.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/48164241556.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3acf1b0764dbb0fd9444cf060771fbdc/81958424658.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/rivog.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce30a6e8bf51ba7f510de1b0e1643169/labiberos.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9406b706---zital.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93eacf9a4---datuwalaseb.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/93576878188.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/j387i8oc5vi84r2b30mlo3iin6/sigokonawitotunubix.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/dejorotuxaredazasajipuk.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/wuxakolofuvot.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/neluzaxet.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/betavipixata.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/41525589515.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/r99d7elikt3dqpb009pqltboh4/47252628635.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/baveluz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071875986cab---48544488228.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/e8aa17b0fab9dbfcb822d96b7b979378/rototetotejuko.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a3e740e23a68070f32e5aa2d218e8f60/xuzudibiz.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tanomonibagev.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/6138461738.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/bnbnbrlf6ta4pel1b8sfpc2tsg/tiwilebupisaril.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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10516 bytes
SHA-256: 7700a8ca29ad03f0a552451e85e9536f857909b314b012cb0d9b26aa4cbbd3ef
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 19136 bytes
SHA-256: 79ce2e1d638c19588d9da8a32b6d9642286c572c680ed9e1caa8527071d53202
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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