Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f44c1ca1d34f53…

MALICIOUS

PDF

74.9 KB Created: 2021-09-27 01:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d0c771f94e5aa29ab23839f36d0e2d6 SHA-1: eb92ea1d832e8034ae0b0524e068c086beebbc6d SHA-256: 85f44c1ca1d34f536d2af4ce88e75744a4b744be2ad1030a52c184271dae7a19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful external content.

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://infrive.ru/uplcv?utm_term=where+can+i+watch+cruel+intentions PDF link annotation
    • http://fapannimario.it/userfiles/files/80527494503.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/pipow.pdfIn PDF document text
    • https://mkontroll.hu/File/52700748430.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/542688fb46de8f8003e13cfd351a3796/lepizevodowenegodipeno.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7c77769b4---35880387610.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/bokobanumomofapumum.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/fezakoxizimexefewogosen.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/12011799612.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/zapipiw.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/145a997b98ea4311ec93a95e9fe4789e/10997626486.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109120423116296.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/ditagewu.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/35014607778.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/84047926888.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/mabafumemurufifixe.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/2728740711.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/454368125.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/7970631439.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52349745934.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/63742421903.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a7a60c11---26707108100.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/72090582205.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219317458208.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6b4bd83c3039c80dcac8181fa3158551/84168469987.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_off0000bb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 19304 bytes
SHA-256: b8d484f68be3454143dbd3b76beef5818d584d0da09d03f671d6b857cf65626e
font_02_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 10508 bytes
SHA-256: b63b811d3ae3172c9ab336b5f15010554e4110274b2b1d2c74a16d063ec7d78d

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