Malicious PDF — malware analysis report

Static analysis result for SHA-256 13244ef0457e1ad4…

MALICIOUS

PDF

88.2 KB Created: 2021-07-07 10:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 93f143f814dfd293bc8766c6f8a06e86 SHA-1: 470c3564abe83ed66f2f7e337631c2d0f831c09d SHA-256: 13244ef0457e1ad40026ce2d41abf6e3a62b73f84c3d4cb9753fa7dee91e26a0
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 hosting, indicating a link farm designed to manipulate search engine rankings or direct users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://consultingexpert.eu/fckeditor/userfiles/file/22591542292.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/91421499825.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69140772804.pdfIn PDF document text
    • http://candientuvibra.com/images/file/powufowasefobodoxosiwimu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb09c7c7f5---20602939376.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/a7nt6trc0aj90ba2p5thcj0qd1/41468203004.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf43b73bb---2798929418.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/39973216172.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021051508051753.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/30889703534.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/33797012532.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995fe6eb76---rutitifuxaxebogebolep.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/16721753266.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pufamogifafu.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/13508149599.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608424af86985---zubolonujuwuvetawaza.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b61edb254---ledalunonowapotaj.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/064267978e251b133b6ccd8dbc002e6f/20504124109.pdfIn PDF document text
    • http://k1a.ru/images/files/file/besoredokipefen.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/65010913482.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/13296885809.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/vamonebogemozuka.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/bowijokasidazalof.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/99984278039.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/1f277d8073144e5fdd1d5ca0fdd5c078/zalowubenemugawoga.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/70579374208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=last+indian+tribe+in+ohioPDF 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 19148 bytes
SHA-256: 9d198a8b5220262052ea63c13babfd52593f75575ff258c8bd99e6ab905ca06d
font_01_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 10396 bytes
SHA-256: 0746f17d85748b4679cbf7ede37277fd37f7ea7a8383588f8c29a2f6c040c258
font_02_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1