Malicious PDF — malware analysis report

Static analysis result for SHA-256 f955617a9bf5a5f0…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 19:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ccb1ca38dbe7079ef461f8b239415c8 SHA-1: 31092ee806e720ea57a74116d02d6f2884d90749 SHA-256: f955617a9bf5a5f09c16555b5d538e4f051eb12a49df785126d92ead9542246a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for distributing malware or stealing credentials.

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 http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375a1655d63---sawax.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f60b8f8a3---35283390347.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/suwaxulen.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/tujuxalakodu.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/palinotafosijefazuru.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/dijubokawep.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/45664614529.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8be3534077af7998b43c85efea05256a/pefanug.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dcb7155e88afc3eb90a08ce9d6861869/sojafegufadoxuvejamola.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/davubebukajawubetovewam.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/gewaludenamokewegesaf.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/86060744309.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wovutipefenetolusaxonitup.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ecf30b43a---40576508828.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613508a1698bd---fiwuvigakenumujifagi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/disedujepapivategaka.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/pibewofo.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/pazenewagonokojikopes.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/ripadixedu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b1ee008319466089c65fdcc5a2508ca0/gutira.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/zotemonojomadegu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11392552724.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/savovaregoli.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/64653120180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+games+for+android+online+2020PDF 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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 10992 bytes
SHA-256: 55c44340d5aff822515c3b6bbab1dc83189a45925b00dbae1ef1f1e7ad36a3a1
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 17944 bytes
SHA-256: a2f6d94e54b1b6fa2758883b005fbe8bc6ba4848285b502deb6a8369774f8035