Malicious PDF — malware analysis report

Static analysis result for SHA-256 701a223a1a4ffd4b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 16:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f6e5cb887aca458b2c4e98dd4c8d118 SHA-1: ed4e1dd377643d99c43c0bef3eba86345160ba20 SHA-256: 701a223a1a4ffd4b2a8d353180821f6ed8026a36a84afdb2566ce56d1114eb31
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. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or distributing further malware. The PDF structure itself is also flagged for containing link farms and potentially compromised upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=chrome+os+emulator+android+studio PDF link annotation
    • https://marljivo.hr/UserFiles/files/midovez.pdfIn PDF document text
    • http://hzqzg.com/d/files/nenosi.pdfIn PDF document text
    • http://immopolignano.lu/images/77039996931.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5cb5bcfdcf2e2708ae169c089b6ff891/xefudowarajodap.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/rodarimizogogonegenuvuw.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4f63db67e103030f57e42850184be52/finanavas.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210904195025.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nusezaberezarupemijowot.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19c0e94e6---xevilajijasufo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc092c338f---35426188786.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/kibuxumigitiduwukiwajike.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1da9a1f7---jawotaparogowarexedat.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_063630_134.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/malinokepaxiwuno.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/18910190599.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/babavivilaxu.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/14617815599.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/moxatomu.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/33026934062.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76c09ca20---sufedogewe.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/25349589649.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303319e5518---83774822367.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/kipegifuzalodizadadud.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b1525ce44426a0b8eacb5457be0f5947/22606497012.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xajadukenivogumarusitoxe.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/noxigonuwafuga.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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 18352 bytes
SHA-256: 34473d291bc50ef1ef8d94ae9fdc61bf688e83caa4d097aa7d41e93334498fab
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10644 bytes
SHA-256: b93ad7389b73d3249261774fc63e7dee7cd725f536721d5de52192c13476c205
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1