Malicious PDF — malware analysis report

Static analysis result for SHA-256 5574022c0172de67…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 04:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73a80e2a4303ee29d08a90da9047ba28 SHA-1: 5bdd273189200a23c477110bd86621063e647667 SHA-256: 5574022c0172de673ba16147b810b438233429729607a5cd266ae9bf1be4e723
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc94170464---nafomojakap.pdf In PDF document text
    • http://harc-ias.vn/Images_upload/files/28067998290.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/27653054807.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160743a29acf44---47843811449.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd5835549---wiladugu.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210726193343_5rr186.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/8416147389.pdfIn PDF document text
    • https://mackbeks.com/files/file/55634503599.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uk5io1vlnmb5tn74jd19u0v3u2/bunuvurusonolosikuf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4fgkinepqhin2jrddm2quh1d70/66438046409.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/64712691029.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/25684091287.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00fba34262---womilaxodopizibefigaw.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/koratameboza.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8cd95b184f5fe6a05758ec09ac0ee9e2/29892558103.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/gukedivexag.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610edbaaa36c0---40494957874.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/loritopatu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/fowokovudijexifufitaxadul.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/40ba6f46a9f0adfd6dcb3522314cecab/xewav.pdfIn PDF document text
    • https://davaocarrental.com/images/file/74823769640.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/47095091097.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/guo10kohffklpud3drb82fhje0/99604488839.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/71761215746.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2652bc158---53049158701.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a513ea97df3445b7c244af7337bd38e3/61170166790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fonctionnement+carburateur+pdfPDF 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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 10784 bytes
SHA-256: 9f6416933bb655dea5eaea291eb28fcf804039142d618ed0487b9e0cb8f10aac
font_01_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 18896 bytes
SHA-256: a35de27d0fc6cc56bddce330e12de796baccab4debdc775888e5f41e5f44118b
font_02_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1