Malicious PDF — malware analysis report

Static analysis result for SHA-256 784056d9bb82d7a3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 18:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60426811ab2e0a9d7d808d8aa35313c1 SHA-1: 4a81bc9d3ed8eb76d82a167d74ed79cbee4744dd SHA-256: 784056d9bb82d7a32f5800e4bc8167f346ec4b16751cadd7585527c4e333ac3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306c0959d47---10680016999.pdf In PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/nigiwirom.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/73529988442.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/sixon.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/gumitibisonegidefuvit.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e49117128---84235134631.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/84524580629.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/porukozunaf.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/90138445901.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/77666645066.pdfIn PDF document text
    • http://simonide.org/userfiles/file/87144934538.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/gosutalavojojijaz.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/94631870331.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/11934249735.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/sodusovobanafi.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/janowujewozowinuw.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/91573446317.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/gewebenagaserafezinir.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/78217831831.pdfIn PDF document text
    • https://menu2uplus.com/images/file/58086774313.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b510b99322---79482183041.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/20837630617.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/kitipamizomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=backyard+monsters+app+for+androidPDF 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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10996 bytes
SHA-256: 9e87c342201903e98d7a5215917bbe64e79e9f0440753377b7f057db3bda1f88
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 17688 bytes
SHA-256: a8f01e4181a426b935b5e3f89878be0a5b4f5c039dd3ae0c28e89ed17b6928b4
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1