Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83161300fc39073…

MALICIOUS

PDF

89.9 KB Created: 2021-08-04 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3753f5289179f2bfec2d9f1b5e730bfe SHA-1: 7730a1f461354af18206a087593bef16e4d68d38 SHA-256: d83161300fc39073c824804ff69d3957322397dc9c9fec554b3e6abd66ef16ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://gsxr.hu/userfiles/file/39342953544.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/242fd4fa9b8d277b4a912e4306059af6/67472501561.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4c57db87---96608776499.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/5145840619.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d5668bed3---87298194606.pdfIn PDF document text
    • https://sanidom.pl/img/file/85068362775.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5032c3bc---sijimovo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f549c0a52---xegoliguk.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607490a416bf2---vifokep.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/kutavasaretimobofulepaja.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607967b75709a---suzupugip.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/252c6b04315d5f4c999443a269c30acc/32589990255.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ef86298f6a7e590f492d31cf3e28096e/metulom.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74929521031.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kajasagutuwibebumub.pdfIn PDF document text
    • http://boxethai38.com/upload/file/51175922651.pdfIn PDF document text
    • https://parfumzone.ro/files/file/filijakupomowigikowavodom.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/36819283125.pdfIn PDF document text
    • https://inncredel.com/uploads/35077053312.pdfIn PDF document text
    • https://bursac.net/userfiles/file/magidaberuxazamibufan.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff7fe13ee---68696909645.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0840070e---gebofipi.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/nuforivoke.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tizupunekaluwitujamixali.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/tabiwamadipega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=simple+past+and+present+perfect+tense+exercisePDF 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_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 17048 bytes
SHA-256: aea815e0a0cb386445072fa36402a9149b39cf4266d37f5d625802dab745409e
font_01_sfnt_off0001255a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 10836 bytes
SHA-256: 2f5d779d7632ca14318d27b339f6c55d9f0639dd251e2b027fcaaada26f1de16

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