Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c048a295be4b5b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 09:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 38d5edb9cd1039c8e0a04e76050b2491 SHA-1: ca6bb034ff5c42250aab2dbe71c83bc413633377 SHA-256: d5c048a295be4b5b006cdc07b5c666a61430d50bee6d3707bd5986b7d6b03cc2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other potentially compromised sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://edu-mate.kr/_UploadFile/Images/file/26985136238.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082b450476ec---28404462189.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/73911081791d4ec6a571c4301a85d57b/vakesasovimawu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160933057c7b58---87781161988.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/megazafaxukevatelimi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/36874156829.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e902694ae5---rivodowewa.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/luguzepurobuvodesutemi.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/jobeganutademefowu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0e690aee19a1e6f431844d39f5b263e6/sebilijekigumirat.pdfIn PDF document text
    • http://tchid.net/userfiles/file/zuzozemilokimaxogewo.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210620_A204B41C4EDA3104.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8dd7e1fb---rejosuwabeb.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/77aeb2b517214e3daa242ff52c9673d0/17340535218.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49933335c---31416855127.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/zozuvi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8146e476d6---piromofodudu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a88feb6f8---49128621818.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/buzinupeporepozisuvidu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/vopiwelurariminemimajid.pdfIn PDF document text
    • http://fxmeat.com/upload/file/bc96a6214df1e4e37ac126daf1f355b2.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///43441846380.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3fca7af52---71023703988.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/34835900554.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/91008578556.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/falorokujifafi.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/du1ock19issekipohe2uam3u6d/79758567934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sure+on+this+shining+night+morten+lauridsen+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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 16356 bytes
SHA-256: 902797663cc6da8635e016e72d2c840ad69bcc4d0d1e12f67b37465eb7ffd3ca
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 11120 bytes
SHA-256: 8aa389333ced411992d943098462332215d54e51316098175153022807461da4