Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f8918d8b388193…

MALICIOUS

PDF

100.7 KB Created: 2021-07-31 21:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c27040d173c042a63b70d4afe0f933c SHA-1: 8b42cc7bdc4708fc1ef9be0cd366fce86a0206ce SHA-256: 91f8918d8b3881937719c1e6cfe5cb921789faa2cc4f0a4ce05d532f7f81d2e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://allytemp.ru/uplcv?utm_term=what+is+quantum+jumping+techniques
    • https://anctools.com/ckfinder/userfiles/files/xonepejimapekojuwakel.pdf
    • https://ghnservizi.com/file/jizazogobogub.pdf
    • https://www.zolmedis.lt/ckfinder/userfiles/files/goduselevoj.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4aa52977b11b15352de0144643ef6717/gujapepiner.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/kasoxixugakomilor.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219b98f713---veruxonixojigutoruwij.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86207022f0---sonobefojujuraboduk.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052dbf0a75b---foladasurazovopojuroli.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43318350970.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086544fe5515---82384899108.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6197fd95---34672939134.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c2d8a5f719b3968d4500ced0bc6f6a96/72878975189.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpiftfr2usbknhb10int631fn8/42701534505.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418a54dc4c---vofiwubadolamovaxafovo.pdf
    • http://stinpo.com/ckfinder/userfiles/files/jujesuvetirixuwefidu.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb66c4b829---1304599529.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/litozuvam.pdf
    • http://metalzilembo.it/userfiles/files/fatazifimu.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f230096fc52ccd53f238ddbae61f004e/kifigujorawusidu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b39377d6f4---juravujejimalakenazese.pdf
    • http://provia-events.de/pics/fotos/1/file/17760052152.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/1v9dks6ana5jbjdtkrfuhpnf9u/vodujumet.pdf
    • http://phantasos.org/userfiles/file/kagolititabaliv.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/i488aci3robcf6ikmmgld3qrnc/vulux.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ed8f66b21096afc71d86c6561f275732/44592051945.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pu82kfpnaujul9kem3d7tcbfdq/tukavokisibub.pdf
    • 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_off000123fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 16792 bytes
font_01_sfnt_off00013c0e.bin
f6d0658c878209c0a3114703f770648db2a55f78e9283619552326d223d3dfa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0E 17712 bytes
font_02_sfnt_off00016a8b.bin
029a060f79d46a29e16ad6cbde61860eb4eca211a3727529bdc72ac0ff9402f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A8B 10924 bytes