Malicious PDF — malware analysis report

Static analysis result for SHA-256 2892ef49efb5107d…

MALICIOUS

PDF

92.2 KB Created: 2021-06-26 00:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22d8d910070493da472e52739707c399 SHA-1: f4d0e8797a7fd6bc6f3686b501fecbd2d7adfcdb SHA-256: 2892ef49efb5107de7cab26fa33ff8f3edcf056117ac93fb42b82e8440b06c36
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDFs hosted on compromised websites. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609085ae76961---jedakaziwetibuvaxeruwuvix.pdf
    • http://gayaarchi.com/userfiles/file/20210606181142.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160759708b09be---losuwum.pdf
    • http://ahxxzx.com/userfiles/202104/file/39215767215.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/lupubiga.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aa8763bf69abf90db11fee7a9ce7262a/wipakorutexijarokezanize.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/60801498877.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-19/20210619025529725763.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607108174a739---gatut.pdf
    • https://aimara-bg.com/userfiles/file/xuwuwesomopozikofaviwij.pdf
    • https://aslimitada.com/userfiles/file/26653883800.pdf
    • https://nevisnews.com/userfiles/dabivujiteli.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d940053ea6---porojugokanitagufiset.pdf
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/jusebu.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607679c30cfc0---xetokonowexezaxowubudogu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b1b9894c---56242232672.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df004de932---66150840097.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baac5eb8c7f---44127731559.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b788fff7---fobevavubudoteti.pdf
    • https://p87.hu/files/93179666498.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/xuzigadatadakotoro.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lurofekoli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=gift+of+exhortation+bible+verse
    • 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_off0001074e.bin
013082f2337342ba2696f0ab328bec77638ab3357b6f7d6dd2eca4ca53a2a75c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10656 bytes
font_01_sfnt_off00011fc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16792 bytes
font_02_sfnt_off000137d4.bin
eec18c5bdf32db71ed85be41af1763c48154433ab60d52ee6de380a523d8470b
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 16936 bytes