Malicious PDF — malware analysis report

Static analysis result for SHA-256 447026377b049ea1…

MALICIOUS

PDF

94.3 KB Created: 2021-07-25 19:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9db738d58462f59a86e971f1581f1da1 SHA-1: 66eef2620d9599b90aabf243dfe63610e63560ce SHA-256: 447026377b049ea1955fbdc3619d3fcfa2d96203dfc3e163cb59ea1f62eec5fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://askort.pl/Upload/file/45974968477.pdf In PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c92985a82---didijewisofusavujisuna.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a7d0ccd71---mimixozilalureg.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/20215761597.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jiep3lf8inseooe4p2rmb6cij5/87516446053.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fewavitafiduj.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/1ae0db38bb456ff0af3f3f96be9b03d1/70206383026.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455efdd710---79943812898.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f49ad19c2900afac2de716f3d2750ac/55797834599.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/9267ebf085a28d7daabcdfc1466ef6a7/16846343165.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/o7ne883deli380mt1u33s7baaf/80160735995.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082285ad0089---palulugozuka.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/podirebabonumojejupujusen.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/77377972072.pdfIn PDF document text
    • http://iworking.vn/uploads/files/79627786155.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a582b9101---40407561568.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8be204f64---41369414442.pdfIn PDF document text
    • http://fgosvo.ru/files/files/25347830696.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ee4e8f29---roreba.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/wazemalikasufedurotoj.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e135c9a346---bodunitalepa.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a042a324---xaxexel.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/b122a6e0f7174d507f8abe1467f795ff/zuwiresevowulilafegezud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+resignation+letter+for+service+crewPDF 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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 17204 bytes
SHA-256: 6b7e1e9627a4637649eabf586f2260a5b681db6a95653d8afdd09dffd335d3b5
font_01_sfnt_off0001389c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B3 10912 bytes
SHA-256: b654da669ed40e1029acc0927daf2d08638502075368608d21c7bc6ea89684e5

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