Malicious PDF — malware analysis report

Static analysis result for SHA-256 441c94d057b3341d…

MALICIOUS

PDF

89.4 KB Created: 2021-08-28 17:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c5de4204649e041ec12e1fa0c6a38dd SHA-1: 704f254c6fd3591fc868a38cd71c0d72395d7221 SHA-256: 441c94d057b3341df4223fc072090c9c1a9d380743a1c04f37f9528c13ad2689
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://alutat.com/data/file/wogamu.pdf In PDF document text
    • https://jkmart.net/FCKFiles/File/2081211521.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/85818895393.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb28ea1c99---73281634130.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610734d62d6d3---1308590284.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/46f959acdedb2532924655d8b85bacf0/76943438353.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/776eaae7be2340f3f3533c73d5dc5c0b/12741625134.pdfIn PDF document text
    • http://schubert-hh.de/image/file/13281468550.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/cjjojir4qetr4hjaf20oeer213/tikikugukototurusi.pdfIn PDF document text
    • http://dakmet.pl/upload/78262071668.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b615dd3ba---detopukigetafaserep.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/81413558151.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/gciu1ae7rmkul62rom2btc5sg1/26323542414.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/6b0e98c006747276fd3e6f04987a6229/44947546209.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac5e20f8---welasexukip.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/39544260459.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/xizemuwanagixanez.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081347fb868e---58541262033.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pewizupabowepojulorone.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/97645390710.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/49179460425.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9022436b98---54560223059.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/ratugavurododavusitak.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16249412295027.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739a60156e6---18781823080.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84393641549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=house+of+cards+s01e05PDF link annotation
    • 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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC2 10528 bytes
SHA-256: 5844083c57c9b1e93345b115117231fcf207cbf27e1ecf6f0b65702215d97cdc
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 18320 bytes
SHA-256: 1bdad547deb9c4fdb0adca30f9de0709bd129dc69e1148e32a2b20042ed5a0b8