Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba3471f28afbb09…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 15:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30a206f710d45f2756811021ac7dc496 SHA-1: 594e6916bcde9a320ea6ca4c15cefe2bba34d85a SHA-256: dba3471f28afbb09352cc15ccd65b58f73fe4aeeb9a13e66e5b0407e9b7d2516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8f2969f62---57496922796.pdf In PDF document text
    • http://orsini-blasioli.it/userfiles/files/44985156240.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e03e6fbe7---81568288103.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/58151135152.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acbbed6275---bupilikipomixalurowiz.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/kawopegaxaxi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100727c20dcc---jiwevejek.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/tatezuwusuvalagan.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/49427024454.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/bazovoridofune.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/89247413824.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/6e5a22c3680feb33c182e4a8fb7cc7f1/wukikebodupep.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosag.pdfIn PDF document text
    • http://babamoleskine.com/files/file/fadosi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5a1120af---72695411972.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/25226601447.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/roxaki.pdfIn PDF document text
    • https://rinducm1.com/contents//files/bumetobowafikatu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/zolegiragivilevugadog.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4df13fe16c7665a49458d470eecac2d3/bubulonerugeso.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/91648135943.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d40ff1e7c9dafa3c5e01baec4bfe340/fukusumotasa.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/zepireto.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/45436649853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=exponential+problems+and+solutions+pdfPDF 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_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 19036 bytes
SHA-256: 8f63909a89682ffa294f2778da2af0a1403d8f17d1a6fcb67b4ff266b57400ff
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10984 bytes
SHA-256: e9271af9ba9128d208b6eee84902af19cf74c6043e5701c64758f4263f59c9e4

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