Malicious PDF — malware analysis report

Static analysis result for SHA-256 d236971c4562d27f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 14:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23f59b0a6ec868987660d21ba04e5ab5 SHA-1: 62fad82bdba3ad02491222a0fc75cc540dff2355 SHA-256: d236971c4562d27fb2d4e405752a01dc9b26b398d5f50eb61de7193b097a1d7a
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This behavior is indicative of phishing or malware distribution, where users are lured to malicious sites by clicking on links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=hilbert+basis+theorem+proof+pdf PDF link annotation
    • http://dashoernerboot.de/userfiles/kelaf.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/84866228951.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8df8ca764---53640399782.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/momirivipirajusebepuje.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/vevup.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/16890965550.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/362b8f6c3aa2032d6f7f1393765c30f3/buxajifegomefi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0fee9a3e7c4104ea8850f5c3abc0179/peposananeziposagavujuve.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/83828958255.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff20009a867---75748156333.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbe58ace5---9450542840.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zasepumagaja.pdfIn PDF document text
    • http://takeacode.org/user/d41d8cd98f00b204e9800998ecf8427e/file/suwafaxovasusorukuk.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tavanuxe.pdfIn PDF document text
    • http://lex.tj/img/file/nitopiwebalinub.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612aaf09c3071---60439848675.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7793d1e3---90431752976.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/60114017156.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/67734bdd4159051eb3f813db7d76c392/58666638385.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/44917079067.pdfIn PDF document text
    • https://ahha.az/userfiles/file/visexijupiliromo.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tivuluxekesuletipiboteve.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/13315573298.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/mebijeteditoboregij.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_off0000bff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 10788 bytes
SHA-256: 9f881830c4518204a8927df90cc353f7444ecca7f47fc04998c4a5b4699d8b54
font_02_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 17032 bytes
SHA-256: fd2e92b0ce1b3ebd9bc10a0e70a05a5c3a2c939307032f4db3c96c4d93eedf7c

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