Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a0376587004c7e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 22:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f965b0898dc8b9db96631b353679698e SHA-1: c87ecdcb28f4722fcd44935b75582e1d3c18556d SHA-256: 81a0376587004c7e598cb8f32a685f9b6a8f3384f4523e05ef0ec39785e788b4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d47db2453ee---keloxopazo.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16090eb8ae0e99---39781805659.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/semulew.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a8257a0db---gifufuxobefika.pdfIn PDF document text
    • http://schokozentrale.de/idata/fadoratisijatavo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e8be8c94bdc2c16962d207f4ec784f80/vukonisoluxube.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9mf8s42d15fd0hbskqk8ss5qgu/mativutijexugugo.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/wedonijojelomisesometijiv.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d7fbe153159a2e3bc20bd791c0771621/64253630497.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7bf18432---valudexasi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ea77ee7f6---79813226727.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/14269235323.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/kajekixisu.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/65292262267.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab66c1e29---damikik.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d7d64326f21e19d9d556c65bc796e73/wovedugisetinikabal.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/nusebakabalifavif.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/58274671724.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/17561484182.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/41307586114.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160987fb830e7b---kipasoromagaza.pdfIn PDF document text
    • https://aedwea.com/upload/foto/26279493074.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4hvg3n22ie2oeqcl0jc0j7picr/95199452398.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/45469298634.pdfIn PDF document text
    • http://wamer.org/userfiles/file/47068771809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+i+reset+my+iphone+without+a+password+or+computerPDF 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_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 11024 bytes
SHA-256: e9bb06bd11b9e98ae08671cc5353f6cd8125635a445a5d68f53170c3282ab0a2
font_01_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16540 bytes
SHA-256: aba22359d7ac8d1248035285f7d70ca7533a9d4c3f80a6de1d5af2462028bb91
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1