Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1d271aaa2ac793…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c053fa9404dbf54b5aebb120b7b14b68 SHA-1: 4bdc2153f76266319c24f70cbaf55f2a9fd88be8 SHA-256: da1d271aaa2ac793d7cd8db199baf07362d54b0d9b97223604d65d1822ccd0d8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting, designed to lure users into clicking malicious links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the non-clustered nature of these links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cungcapluonech.com/upload/files/pukapunaxuwaganojolafo.pdf In PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b3162598e---21039300070.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/50593236351.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c552ac92faa---67461869700.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/10205892737.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/47231556833.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/dijibewazu.pdfIn PDF document text
    • http://poolprotektor.com/userfiles/file/tonimegobujumige.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0975a3ad20---5188603538.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/53163233854.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/69313426142.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/xikutoriwo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fc61a0d9---96230705277.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1848d0ccb---17441768952.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4c2d3533bc4bce9abfddc3896872d8f3/55408935233.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f71811bad85de6a4692ba42592fc0c9/19037852448.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sabil.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/57347279275.pdfIn PDF document text
    • https://nistd.in/userfiles/file/motavajorefiviwitu.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/96393864312.pdfIn PDF document text
    • http://intergeored.com/upload/File/bukolofan.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cb9631d8b3e119eca6e2b51155b51a8/bexabuwudijam.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/56459946968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=english+allophones+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 10560 bytes
SHA-256: bbb7ee1064901503c79f7038e71d2cde61a15d23849f950f5681b8db5408bfbe
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 22064 bytes
SHA-256: db86faf80fb8ce6b4279e634023e1d342e6dfd1c8eccc795868fb9007dc89ac9
font_02_sfnt_off000127dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1