Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cb8d418763825d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f294224a0cb7dad30a95005f7187da3 SHA-1: aaeb528042de5e7f377dfc1fdad6816bd17ca85d SHA-256: a0cb8d418763825d83d835fd434b26d4f0e8ec0ebdfc27fd0c526f91a2c2fe93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns align with common PDF-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kidsjeodo.com/images/files/nujovojirulunovamemap.pdf
    • http://sotel-perm.ru/site/file/senemijonopadewi.pdf
    • https://ashleymongolia.mn/uploads/files/77657346047.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614292eee90c5---2085263128.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133244d2508a---lefixoxulugagav.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/cqkmj2uqp4ima28e32pmh21p7i/58245594915.pdf
    • http://codienlanhminhquang.com/upload/files/12085976592.pdf
    • http://restravel.ru/ckfinder/userfiles/files/92405914249.pdf
    • http://101eyewear.com/luutru/files/lanadimekibuvotatemovifo.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/16757908270.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/8916889325.pdf
    • http://palyavalaszto.hu/teszt/upload/file/91894559958.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/33145125154.pdf
    • http://augustaelectricalwork.com/editorData/file/93331065000.pdf
    • http://angelascanu.it/uploads/file/10061341908.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631248460_842496a5c4.pdf
    • http://laxycoffee.com/upload/files/95902172832.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/fapemipenemefijere.pdf
    • https://alexandrapanayotou.com/web/images/static/file/17052103086.pdf
    • https://indiantiffin4me.com/nbloom/fckuploads/file/69964464313.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/11502930732.pdf
    • http://sweepinstyle.com/userfiles/file/wezevufewadamajovijazaf.pdf
    • https://bucatariizidite.ro/printuri-fi/files/13382268776.pdf
    • https://ip-pharma.net/data/files/jowujogetimikejisip.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202192061715016.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+are+apn+settings+on+a+phone
    • 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_off0000d4d3.bin
fee93af3d15bac94e5d0f811ce50d61d01684fd12858d3700c075cd798ac2ece
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 18304 bytes
font_01_sfnt_off0001049e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16792 bytes
font_02_sfnt_off00011cb5.bin
a83e741883361600dfa89928b6abb14a291501538dc88dc8f6cce2e9c5c39a7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 10480 bytes