Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b0ba1c4f45bd62…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 15:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec5e1b754f924d3e7779317ce1711191 SHA-1: 55e33c234b6000d4df258e15a6d28d86a2968cdc SHA-256: 88b0ba1c4f45bd621852297a122b8bb2360786ce4441274b1af8ec5b9d270f38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan characteristics. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The presence of these links and the overall structure indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=how+do+you+get+pokecoins
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5339291c---tuwaxiwevibojarufiputi.pdf
    • http://hiredriver.com/uploads/assets/files/buwupex.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdf
    • https://pointwebhost.com/calisma2/files/uploads/bunujugizikovebotodimi.pdf
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/85872142267.pdf
    • https://akproauto.com/nbloom/fckuploads/file/73330831172.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ba408e28---lavagemoforipudajunaparu.pdf
    • http://madveras.com/ckfinder/userfiles/files/fapigidazodol.pdf
    • http://nj-rshb.com/v15/Upload/file/20219123189825.pdf
    • http://immodraft.de/images/architekten_agentur_images_/file/kidomagewirozo.pdf
    • http://sin-hua.org/userfiles/37938533753.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3beq1lalnau9bjj85bujfk5la7/63902443071.pdf
    • http://moscowprice.com/content/xuploadimages/file/18444058483.pdf
    • https://lensmam.com/userfiles/file/81451517700.pdf
    • http://archissimo.eu/userfiles/files/wikixomuxanasu.pdf
    • https://cahayaapi1.com/contents/files/piboz.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/balunopazejilopaseluz.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f322fb08---mewutu.pdf
    • http://seibyou-koujien.com/files/files/guzorapepav.pdf
    • https://kaktutzhit.by/uploads/files/sofidimawedexoxovad.pdf
    • http://www.tomasjelinek.com/img/pub/file/jupubukafe.pdf
    • http://gapp.fr/medias/files/17225902186.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/nifasojeburu.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613935c4c702c---80073827030.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_off0000e48c.bin
248674700de55c26519d4922cf58e7a8a3db256973cc4985245576f0ba6d3b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 18444 bytes
font_01_sfnt_off0001149b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 16792 bytes
font_02_sfnt_off00012cb2.bin
3a6670d3b67705e31bc61702db51e9829f3fba5e99f0968dc1aa6b3b3e3e7215
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 10764 bytes