Malicious PDF — malware analysis report

Static analysis result for SHA-256 63104c20e9f0628a…

MALICIOUS

PDF

100.5 KB Created: 2021-08-29 15:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6a8a89c7ce79fcc8ba994bf129eca384 SHA-1: f51a27e9bd6509da5863c0037696f8a2062b381f SHA-256: 63104c20e9f0628a8c55359e93318f95156c37b8993306f12cc5d182019ed7d0
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. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=army+jobs+by+asvab+score PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4763de1889---posamot.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lazipoxilumawojoxekotan.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/786f059e976f104d13d54d32450d0605/17461290387.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112240b323e3---40235826917.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mksek2q7mmhb3drbas1gip51m6/wepigilibame.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51e8be12c---90321655839.pdfIn PDF document text
    • http://iccarrentals.com/files/file/70921669653.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/oahvrojcbsvfkmaiss7eboujp6/linanapov.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/87523899661.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9e8430161---purilut.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/28681593288.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/kutupozurixuludemepoxi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612780f2b708e---34653214217.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/20907160607.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/32521807901.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/parej.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/ponaluzaxozadudib.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64eba3c499---likiko.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c08fb5053148662de810cfb311d6dd8b/10238412466.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/53783238352.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/wefewosunopexewexurofujem.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/nb1srn8vv6mm8bm2sgumd32797/72453394.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/modonibepejufesovek.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/18093988425.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211707702393.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_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 17860 bytes
SHA-256: a36c8a2049afbc5a3213c0dfdeb3083958c61ac81edc57264577a767140e0529
font_01_sfnt_off00015334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B4B 10484 bytes
SHA-256: 0775632b013a69112405e2ab8ea643fd776387ee9a52f67a09d1cfb9b70d92e9

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