Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba6c9444cbd240e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 19:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e881cb9bbd9954534c7922aded14d3d SHA-1: 2779f13272b75234e6e127365f70812465f229be SHA-256: cba6c9444cbd240e51e1f1c4148d8323b3d599babbe0bbe24d247687b3ebde07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=android+location+sharing PDF link annotation
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sojedubokab.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zavezubefenejileva.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630952346.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/84484427799.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/17728077532.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/40749539926.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jatefevomokijir.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kapitugi.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18089724526.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/jupupewi.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/40514853272.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/wimowitenokakalafozaju.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/51245045036.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6b29718dba22ad46d0aba2f65501ba05/javubakije.pdfIn PDF document text
    • https://subarini.ro/mm/file/26800977911.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/33908877936.pdfIn PDF document text
    • http://canvangdientu.com/images/file/67548623773.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/radiwit.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c555a11cc---4588727947.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec0cea170---26658180288.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/96765831895.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sillkeak8gm56u9vda1v9imav9/89486713342.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/4963666808.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/neruput.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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 17624 bytes
SHA-256: fd9cd8a2ca0bd258f4b4427cd8ee2bec286464b6eb2a9749f274b29651182442
font_01_sfnt_off00010efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFD 10496 bytes
SHA-256: d6471d12249589d1a9979f6e613a5ed80c096c14f14b2ef0a685c17d10ab52d7
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1