Malicious PDF — malware analysis report

Static analysis result for SHA-256 d388dea04c0f6b70…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 15:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f49995f98fbd6b8c3f111067a0e2b6b SHA-1: c692a0d6be2e0668f5a6f5684e18a2666c5f2215 SHA-256: d388dea04c0f6b70c69bdd1b89713f554ccb5863201285d5f354b3e89ea09d8c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=my+hero+academia+season+5+episode+6+english+dubbed PDF link annotation
    • http://pantryscan.com/123cars/imagefck/file/ferogavurenirizufesotag.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996555964f---nigejapadig.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/xamege.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/615ae2260f37480f71df88df3f79f162/70279223032.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134220686a17---99387377087.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/garaxexuzofogagolebe.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905211624.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/sumumamape.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/97675751194.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/582187cd9eb982593ef8472c1fbda35e/rilukedapuzikikowabogan.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea20478cdb---vaviwadimofotir.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/nelekamifog.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/tumedop.pdfIn PDF document text
    • http://hidropro.hu/upload/22798744714.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/wodasamatolemefalogiwi.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gedudubuxe.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/60839369894.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/gegipewimijivisegapo.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/rusewesorewexo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/34472971879.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/misabivawax.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/burugufikavufovesos.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 22152 bytes
SHA-256: 0e92ac5f9ae1aeea2be97fefa949728e69b816957c16abba1b0b29065836cef3
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 11512 bytes
SHA-256: 57d7d21ee1378c7b6ed6086cf74f9f2af701e5f2f5800e1c4fd15b1761434b51