Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae67f76ce9f0238b…

MALICIOUS

PDF

79.7 KB Created: 2021-06-30 01:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f23d1a0fbc37c71fd3636c8e5a153c93 SHA-1: ca62ab0d01ff7b9dfb368421fe131e7b018296d4 SHA-256: ae67f76ce9f0238ba4e53d55e2ae3e9b6f76f1518d40b28886231c0fdc16df31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a malicious PDF detected by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs on compromised websites, likely to trick users into downloading further payloads. The presence of a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c0026a4d57217a40737d253eaf270fd1/98845827330.pdf
    • http://hilimall.ae/uploads/files/24069243246.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/24730316852.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b92aca7d591---61770769876.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2674a28de0993c582b7149656b93dd83/11751612419.pdf
    • https://cafemocion.com/userfiles/file/wanipopexubadadapopexi.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6294f3d3---kexijumawotijudivu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8264lfq1tjoennr95na4ckd6uq/lawiwibanibomoxikon.pdf
    • https://bistakalikotenetwork.com/userfiles/file/49633032184.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f7b73fe3---49067583857.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e05bea3c6---27549259909.pdf
    • http://bmsorganica.com/userfiles/file/26227827713.pdf
    • http://northcity.rs/slike/files/7764986686.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e8b963976d0ec164666fe3f3d349b438/7890830275.pdf
    • http://bajajsports.com/userfiles/file/jubazabikotoropulatepik.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2f6c45a05f40637729496784d95da40f/vikobulubejiporixarapozu.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2fba3p2uos7t3e0qpd54pqcctj/34002550724.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073cdae076cb---37963531448.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t0fvdid576vhgbm6o2hb9qajp1/19046012751.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8d64efb4---14727285236.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db8d4d0d6---87730495144.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gifted+hands+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d240.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 16792 bytes
font_01_sfnt_off0000ea57.bin
eae8cf536f6119c89b293f4c91e62d7e0a568771110d17efc14064b90c501aed
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 10620 bytes
font_02_sfnt_off000102a6.bin
b3b80a35bcca560cea3bcf29dfc779dfbe5cf4a526b863d0dd356240dc72a053
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 17300 bytes