Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09d4efb70d20980…

MALICIOUS

PDF

86.1 KB Created: 2021-07-17 03:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58dc5acf0712377c0a9bec0c3cb79cbb SHA-1: fd639c3c928529f0b7f1998c3ac075d8d5856870 SHA-256: f09d4efb70d20980881e6c0657cf70091470be3e4959c407de226f74b2cabc82
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a lure to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure are indicative of a phishing or malware distribution attempt, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://angkalaris.com/contents//files/gunosonupekiwut.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608988f265dca---sakovi.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b224f1e122deeb76eefa3a96fb1c854f/894327546.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619b7762cc---kijex.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2d0c295527165bd56434c2bf471c40ee/30648617744.pdf
    • http://eot.mn/uploads/userfiles/files/640791682.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/937lqc99o3dc0egejc2f9t03kf/poxewereb.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743a2d0146c---88677415793.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a313995adf3---nonixe.pdf
    • http://dajuicebarus.com/uploads/files/sixipefog.pdf
    • https://landbondcorten.com/attachment/file/c564ed7493eaa9306aab1631ed4f6253.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/8526194212.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58dbbd649f---60393875368.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af55452ca---totududolotipevejegifib.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e8f921ff9c4668e1938dbd7404410149/211965978.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/147e0a09f9d4a087bc8c6d718c6f4c61/30440407714.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a0dbc3b3a---68380228047.pdf
    • http://timnhanhonline.vn/upload/files/48357613961.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c77f0020---73144228303.pdf
    • http://renovator.cz/files/file/23910353372.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f74f960deaefa0fdeca961954e4db30f/69120864488.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da636a72bf---34663358059.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stewardship+performance+review+phrases
    • 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_off0000ea95.bin
14a45ed00f7232d1ada748e0c42b68350b56ad7951ba5e483a01da5906d52d78
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 17360 bytes
font_01_sfnt_off000117c1.bin
f4555cfa727ef5999854760af20726e9a4935e471b9465d33b0fef0727392280
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C1 11064 bytes
font_02_sfnt_off00013168.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes