Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35117ce02ab33e8…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 14:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 890da67d2ad6f96aaec6f34837d44d21 SHA-1: de0fbd8d9d80f056dabf902bec9c8dd5a46624ed SHA-256: a35117ce02ab33e8b24b7642e19c1d891e7688c3cccdb241d5fc4c0c36f32201
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS uploads and disposable hosting domains, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.abcklima.hu//data/editorfile/guxemotiwejemuneraxen.pdf In PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1cebbahr1a16l7aql941f69u91/malukifilaj.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/84f2053d05640829e2fe079354e1ee80/tikibunevowazum.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/brobqksfhp5kulgu09vqi4ono8/59387524548.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/vuvipijediparanuzogepu.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gipisijur.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hfj0cb3ma247jss5t4iqlrv5tu/zatituvivarosifagujuwa.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/tatezip.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/jdltqqd3su307qi72rldnile2p/18608389049.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160971a9a53296---11166687049.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df828b4b9d4---sifefetu.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/jevaxekemalatemekasitoluf.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/fuzowabivetagixedene.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797538096db---xazesiw.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/7j8v6kv90tdkgmcvkvi613bccr/xoleg.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/guropeterisezug.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/32188449115.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5d7f9c5a1b33990acd3df82a2975f135/fipabivelino.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/33304891439.pdfIn PDF document text
    • http://odumakus.com/uploads/files/vilutazufulunuwugulonidof.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ace367ad4---meveropigus.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca95a52cd---fukikisati.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/68083335409.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/51967836551.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/42950313716.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f317d05b0---92067130641.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/88179338090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=spiritual+sojourn+meaningPDF 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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16764 bytes
SHA-256: 2032c72b79ec4f808aa82a6e56c7a63d980c764752bba1115ccab2db6c7806be
font_02_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 10900 bytes
SHA-256: 6b9a69d3d4cec89c4f9f19f209bc9d9dcec1114e6dd5fc2b1460c0dd947d43a1