Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd10fb5fea1ca91…

MALICIOUS

PDF

96.3 KB Created: 2021-06-28 02:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 642eee18cdf460f011b5eac2b3b8b61b SHA-1: 1cc4a49d5e0ffa7acbf605fa8050b2ac6422141d SHA-256: 3fd10fb5fea1ca9105b82c163727f81e12b9e3ed5a2e6346f0c9e7cb44718189
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=elasticsearch+cluster+red
    • https://tlproduct.com/userfiles/file/510034036.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7cf9856bc8a004d74b4cfcb77e4977f3/tapaluzisategelawagen.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n96892k2uehhvbo6ggdij5f51/bafozosogube.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160acbdaa7b124---56108809448.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/mofofozuwebekalapote.pdf
    • http://aweibel.com/Photo/file/27850286493.pdf
    • http://haniltm.kr/upfiles/editor/files/biguribeliro.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/nonidej.pdf
    • http://sushi-belovo.ru/files/besosusunudabapenexuj.pdf
    • http://omonetach.pl/foto/ilustracje/file/85637939593.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1f77374f---28289919067.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607faaf12bf82---47724520341.pdf
    • https://telenovella-bg.com/files/7575671948.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275f713ee6---majupoxazipiforo.pdf
    • http://griby.biz/ckfinder/userfiles/files/tefikijuxefanemexoviwev.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af75c9033ce6337f2e47793181b2c88b/10839668677.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b87fceaab---916596481.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e4b423f5---45026460415.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf486e6256---fifedagakidexavozaxojumap.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/49326547e9db40c1a74ad17296524d4a/vupivozoxowufusigal.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/misonozuzuzalanesoxa.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160779e023b465---mikeravijuzaliminif.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c05f0335e---42101057514.pdf
    • http://172.20.32.95:9200/_cat/shards
    • 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_off00011581.bin
d414898fddfb5818509454c1bb3e5fea11768839262562dbb3e70aa9f6be595c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 17824 bytes
font_01_sfnt_off00014492.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 16792 bytes
font_02_sfnt_off00015ca9.bin
12c0b4f739840969090a3332d85aad48f2cc68338db91903e8764f8bdc0b61de
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA9 10328 bytes