Malicious PDF — malware analysis report

Static analysis result for SHA-256 f253beb53b436949…

MALICIOUS

PDF

112.4 KB Created: 2021-09-01 16:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c04388276a26e93cf77ddca600ee611f SHA-1: 4243f5c1b87ab040db68dad8b936c212ee061c16 SHA-256: f253beb53b43694976d3aee0e04a43c967d206e6221930e9d41fc2ee4a283b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, characteristic of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to deliver a phishing or malware payload via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://leganordavigliana.it/uploads/file/83174016274.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/mq1ql64qkgd04bbrrubsktlri1/fukitibenudoxovinefuko.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/japovo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf9ec5c6664c976d119f557abea16c9c/kufigimina.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/93835871837.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/92039342367.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/96479540131.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/95285278510.pdfIn PDF document text
    • https://mmtours.si/uploads/nixorofalej.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/7891817832.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/35535365117.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f853aced2c---navanexomaxu.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50840c26ea---bepugakokera.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160daae3a7ade6---99423735930.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f60phqg9q9p6sg29q84bm42vr6/30883993444.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d28195ce0---36220154275.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/74451445846.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160864e5da5aad---89280032204.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/saxogitanafapomejumil.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gefowulabatosoto.pdfIn PDF document text
    • https://matratva.in/userfiles/file/xigorofidulijevomemonavi.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/77618638160.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525182755_u98i2m.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/95725872068.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/rexepoluvavaveluluji.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/31028392411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kung+fu+yoga+full+movie+download+in+tamil+hd+1080pPDF 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_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 11416 bytes
SHA-256: ddd531f54756178a2d2f152a4abe3d4a991027088acdafd7ef8a0b16e61e6c1d
font_01_sfnt_off00015885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15885 25232 bytes
SHA-256: f6ace4d141190d644ccc1038f2fde19dfe82ada4936667015bb36c2176fde878
font_02_sfnt_off00019899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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