Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b388ff29bb798…

MALICIOUS

PDF

93.5 KB Created: 2021-09-09 21:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8accbfa3031deea3fe3da4aeaa50aaf SHA-1: aeb493c95e2d3c2c8f3ef53012daecc8a4ef1896 SHA-256: f83b388ff29bb7988c5b9bcbe4730d0d860bd324d83d442a2e43c4ae0167bd3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=a+moveable+feast+pdf PDF link annotation
    • https://fratellifurloni.it/file/wurepoladuvabiwoxusujal.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lenuzitixo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/lowiwojuno.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/74833832089.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/85276722405.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/kasibukegezag.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/finefarefis.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14201854163.pdfIn PDF document text
    • https://insp.biz/img/file/ralumiduzigerusov.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/javekebomobogazipi.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/winilalitosagevexuzapo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316d21cf297---jadifobepejafa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0fd892ab---20076774725.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf4cb2e95---pidugazokezinimezu.pdfIn PDF document text
    • http://egitara.com/upfiles/files/fanunefit.pdfIn PDF document text
    • http://standardamulet.com/files/files/kutexutajokiwirali.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/fuxutixu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/48242540766.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/loladowisaxotodel.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/92962312757.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132f55b91fcc---55474033731.pdfIn PDF document text
    • http://greenld.com/userfiles/65009451858.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da0d681a1---53853485265.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133025408990---rodobupikifopujujezafijun.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/xomosedoleluwuxepit.pdfIn PDF document text
    • 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_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 19344 bytes
SHA-256: 0d298314527344ee630ea599563190f21da254650868a872f0606224deba85e6
font_01_sfnt_off00013891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 10548 bytes
SHA-256: 1eb6fbf29115f312514ae4484f334ea20a8803584d46df3c45a1b65b7c4733e1
font_02_sfnt_off0001507d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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