Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b194b91e8a865cc…

MALICIOUS

PDF

112.6 KB Created: 2021-07-09 08:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 66ff9dbd408a8fdcde47325cfe11baf0 SHA-1: db97a3b451607333eebbb2ed58be15a4fd0fa3c9 SHA-256: 6b194b91e8a865ccf9e2856848e356d9e897d626b7c3b026777d1b7d5b2cc537
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://musorcentrum.hu/files/article/file/rorokedid.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c55b120ce---60139066587.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/5832867812.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef91e4fbeb---34347171639.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/rusonizizunogafijeka.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160df26f6d3688---lufotukenokon.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/af02791a296083b0ba8a9879b7761d97/97254380899.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/nuxuvitifodexuziroxerib.pdfIn PDF document text
    • http://ashioke.com/images/library/File/47154234771.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/fifulajojijo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/50815826793.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39e79533c---bijabunuke.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/41589518816.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8057065e---56321142321.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073851f3198b---1771215418.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088039cf2f7f---tifegupinopokekilexekikaj.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9q8aasqk47e5eflm087cv2atk8/51573965997.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/95220585036.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/22690055159.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8345f1caa---supafus.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/jn648dah4f8bcndij9lc1vprcs/kipomelivejiwesew.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/28447691656.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/1e9eb5dcfcbf9bd41dfc5e2326415015/92014211174.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/lizitinilajafibexisin.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fj14ut61qk19u5abb9cvb20r25/84390234986.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/xideb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=123movies+toy+story+2PDF 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_off000151d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D5 10384 bytes
SHA-256: 4c40517492e4188791c660e99708042236d5b2b2f9f878b14de224d74fbc8746
font_01_sfnt_off00016972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18184 20288 bytes
SHA-256: 17af784a232a85f0faf00b01ac4aa675deedd9c46bb7f14d7fbd1f9d1f9ccbf4

Open this report in the interactive analyzer, or submit your own file for analysis.