Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c28e07947305ae4…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 13:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afe1b1e2d25bf791335169a64ddd4780 SHA-1: 52c2c2df6d3149abb23c91158a52dbb0e1d6ad9a SHA-256: 4c28e07947305ae42f9f8cc2e6ff2506bba5cd576d00404ed79eb7f1715dcc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'SE_URGENCY_LURE' indicates the document may contain urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kubablimel.pl/Image/files/kanozufukopi.pdf In PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc3c1218cbfb8594aa56a91f3d2b3ce3/pagapajajifav.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/senabufimos.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/98111860619.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052504135273499.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ddb2f0f28---vifojufa.pdfIn PDF document text
    • https://pcetravel.com/files/file/26018381166.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608038107e690---90000185691.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/nemorijisozagabigejugobip.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff3138550e---sikapo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/91976770168.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/21482802900.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cb71db604---vinamunuk.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5555a49b20479fcf61e32d868d68c5c1/68294981016.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13734c112---71049670853.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/16996853125.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/5803671071.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/22804301489.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75eb2185979fb82884e5c7fcd9e573fc/murinulevufa.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/dolesejojovumik.pdfIn PDF document text
    • http://hkalc.com/userfiles/53804182691.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/padaxapuvadu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/502e65ce74eb4090d98ac0c1810e80f2/87288537801.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/e12b9c24749ea1bd0b4ca0b3c427ba78/78174290996.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608862337c2fc---paraloxubemulozobirate.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b12d64fa9---zalozakugadubagoruli.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/pivisiwodutugazadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=disfungsi+ereksi+adalah+pdfPDF 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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10752 bytes
SHA-256: 9796a6e9dc504e0cfa899d65a91b26938027ed9847157e1e455bfcca08856cb9
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16088 bytes
SHA-256: 9815667ff3459c05045ba2328b5bd465aa3c7163b54d94515af394874336c474
font_02_sfnt_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1