Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10dbbb2d95f6e09…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 15:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0dcecadeb2ff581a017a49d436511567 SHA-1: c0a887c283aadc2bd0a40b17c7e45a99c7e51f55 SHA-256: a10dbbb2d95f6e09a3fd8b3a2705990710c7f16be5818b4262b6c022ea99de22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to lure users to external sites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://tigapilar.com/upload/files/38505876300.pdf In PDF document text
    • https://kede.org/userfiles/file/fenako.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/36663666827.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2eed51e1a6470dca33011efc67aaa1a2/zebururebumegevarebu.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/5277983833.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/26606043529.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/71d1baa15d661cabf2a8aee1ea68e887/77844287822.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add527c7479---44260188934.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202108311557565522.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e18d100b9d3f852d7f71cc6c59f876aa/67202107578.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/49393875991.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e60b985e29---36486727092.pdfIn PDF document text
    • http://aweibel.com/Photo/file/15664350101.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/27288368704.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bca6d7f969---71154005930.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/17ef4ca8dcde32fd85a2fafe94629769/kademotofitovuxa.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9416cfe5d---83208577979.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/gazuvobekab.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/ximuleta.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/xiwusute.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607132a77eecd---kufigesogodujejofozu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0b45545fdba6049c51269b4fa0af385d/63011566104.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607226169c13a---lenisul.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210730011434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rest+in+peace+my+friend+messagePDF link annotation
    • https://mediaget.com/userfiles/files/lekelufuvazuxiloseworil.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A7 18140 bytes
SHA-256: f47652fd3e35b288baab8eccf9a144cc04782915dd8d6ef69df950cd26f19edc
font_02_sfnt_off00012fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBF 10956 bytes
SHA-256: 334161e8da39153df000c09158e5ffc8f96613fbf61a53f1ea64e4f6419a903f

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