Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f827f6315087672…

MALICIOUS

PDF

101.5 KB Created: 2021-08-02 16:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a62aa76eb4a02e23415e2543f1a659a8 SHA-1: 9274a9c10f80d088f63b325900e1bcd62f75c573 SHA-256: 5f827f6315087672e70071c63eb7fa388cc68c7cd6d4c81f5f428ff05cf2ec84
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs hosted on potentially compromised sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078652ccd434---21893718871.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908be26f9a5---91662364916.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93f1483d47---nakezaxulanu.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/23700216503.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/suxisu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/518793379.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb552d30771---vinoruzobabadetu.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///tefinaxoditegoga.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/jifofu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4ebde9be---30657322423.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161002144e4db9---jirisevupokav.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73436993408.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fccab687b3---6803257007.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a215ad90dfdc22bce27ecbb5f67f235/bokaxalilumi.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fuvariki.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f853d39edd---jidedifetubujuzifux.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09aeab090---jadatof.pdfIn PDF document text
    • http://kasargod.net/uploads/file/wibevufajerurifilatunu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/mijisogenoliratojujinofu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948deb28a78---29146890894.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17b22b183---21651043653.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/69j3csm8uu8ks0o63lcc1fr2p1/woxij.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/4467775089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+use+momentum+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10352 bytes
SHA-256: 510742990fa1ead558ea0ac9ca009805336649c047a8a63f99a88f5b797457be
font_01_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 17964 bytes
SHA-256: d18931b42d13fb918ef4a9920f2b958092cd4e641ae2a5b94e9f261e12cd5b56
font_03_sfnt_off000172c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C0 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8

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