Malicious PDF — malware analysis report

Static analysis result for SHA-256 391f90d2d969502c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 05:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: becd0084b3d66b3b23370ae6b908fbc6 SHA-1: ad36cde8ee68167ae6be195582aaa577ef7dcb31 SHA-256: 391f90d2d969502ce1bf7edbda20a5047525a961d7e0cdb0cd1737357d99b172
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=the+kissing+booth+full+movie+for+free PDF link annotation
    • https://onutglen.com/caningest/images/file/katizolubowoxoluvebekudiw.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/wanizikifasotit.pdfIn PDF document text
    • https://eguiders.com/uploads/22725759111.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/9770112539.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wimulabixebiw.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/kenewuvotig.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/35307338669.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/fonujutimizuzebi.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7fd31abb4---27404249452.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/medinalamuwi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/68937432048.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48742409243.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/rejibogeposojenefa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417ba22b5e1---25762725778.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/29710293797.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/79319049839.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/93961173628.pdfIn PDF document text
    • https://petribax.com/userfiles/file/44699531881.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/rawapuxixisu.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/puwegezobakatavolenapib.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/fafujil.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tumuvotevagugobosupu.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_off0000b474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB474 10860 bytes
SHA-256: d550c106aef56e1e5b295f41a46884e2cd948b49c566fd410b6e8cd9add5d231
font_01_sfnt_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 18212 bytes
SHA-256: 5469a1a4ba8450b4f2623b23fbf14383f95e92a2ff96c3dd9666a483f203f29f
font_02_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1