Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc8e44e2ec2c825…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 22:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1f7930e2631a2225d4b9c1b0d253889 SHA-1: 1891e01f1088a27f6ab1afe516a962fd2cd2c2b7 SHA-256: 8fc8e44e2ec2c825cd845570a5b1b124c1205476387159e8717f6adff6cbcd29
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/molitewepewezap.pdf
    • http://sgpeo.pl/users//file/20472523883.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607603bca8ca8---87262596147.pdf
    • http://bualuang101.com/backoffice/upload/files/wibonemupop.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac76a27c9---boxigozan.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/da6e98e738399aad063758c1098a2d9d/doduziso.pdf
    • https://syntellect.ru/Repository/file/50523478492.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf121246e1a---ruvebosax.pdf
    • https://airflow-skateboards.com/upload/file/vazanumolufiwomeririb.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0bcf02151136533172f2bf6f5f3eee53/56204854753.pdf
    • http://furniture83.com/upload/files/lozesezuvak.pdf
    • https://amitadevnani.com/userfiles/file/49484485696.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fd340d66ac---laxavilorego.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/d6ede36fce9c8a918b038988906da911/1203729228.pdf
    • https://ewastexperts.com/userfiles/files/60387135985.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f539540---51810435767.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/nekusodigoxujikesuw.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/11f0a8796103f7236ac1e1614f70e079/mogewivir.pdf
    • https://topupdana.com/contents//files/tegagan.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/u0tac19jvcaqdgjls6b5monn36/gukujemegidepunujitu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/200735bb6082d24c5d958863f276ebe3/filijobuvarovob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+game+omega+ruby+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea5.bin
2c5c453a40056869930a7676a94d89d1de64803ef8d681b894512de260e799d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 2496 bytes
font_01_sfnt_off0000e98f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 16792 bytes
font_02_sfnt_off000101a1.bin
5c32c2a0d929d6b0c9759fad184c0812f40cd9fbfd7674375ab549ea3a751563
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 17540 bytes
font_03_sfnt_off00012f5d.bin
61933b6d1297be4ec39c74570e9d150b75aa8610a2542176406983b6de5828ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 10764 bytes