Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a79ace98a8152…

MALICIOUS

PDF

100.0 KB Created: 2021-07-25 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bad3cf398b1ff3f4e7111fe1dfaef377 SHA-1: e33352f719d493c95f85e5031effcdaaab134725 SHA-256: b16a79ace98a815213930741004ffb86da3120a221ebe4273db4792a37b08faa
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://fst-uinsu.net/userfiles/files/sawutas.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8efec24b---84035634445.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a556bdbbc---tixarepafisojetibusekawo.pdf
    • https://traffictkt.com/viking1/uploads/files/nirerifedosalo.pdf
    • http://madang.eu/f_pds/fck/file/31609254707.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6694f0469---gibezumeropeboku.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608799c8ac137---91488782863.pdf
    • https://pima-alarms.net/slicice/file/30792726070.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/00289d223aed5311aadea76514e6676f/16708033662.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/5097685164.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da786102a9a---timadijosedireme.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/06ebef5caeb005b147658a4ffbe9c731/83575032974.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb1b509a65---51923933721.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4ccbd5f1---58915653970.pdf
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/nawodom.pdf
    • http://vietsaovang.com/uploads/userfiles/file/20202016274.pdf
    • http://thaide.org/userfiles/file/18321580093.pdf
    • http://consol.hu/images/uploadedimages/file/93974814899.pdf
    • http://staractivecollection.com/resimler/site/files/64866860085.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0e1f4f5ba---93370635083.pdf
    • https://art-lamps-rali.eu/files/file/26170868260.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd1d6d5ea---pedomesikuzenetofe.pdf
    • https://saam.vn/images/content/file/12334643797.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b8125d2e---79403750497.pdf
    • https://artbynela.com/uploads/file/witovezokawigojeme.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+unlock+zte+mifi+modem
    • 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_off00010d84.bin
69e803819e76bfe6ab5b2e6e3b359bf4e2b645f87476185b1c9cb83930e4d705
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 17364 bytes
font_01_sfnt_off00013b27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 16792 bytes
font_02_sfnt_off00015338.bin
2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
pdf-font-stream PDF embedded font (sfnt) at offset 0x15338 16204 bytes
font_03_sfnt_off000168eb.bin
d260c2f6e77107ec4afb673eaffa8aeb05e90324820a4a5701cb3179bed26316
pdf-font-stream PDF embedded font (sfnt) at offset 0x168EB 10536 bytes