Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11e87480cf164f5…

MALICIOUS

PDF

89.4 KB Created: 2021-07-04 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b258a616cc2d03b2ec74e6c3e0628eb SHA-1: d2ad93590150e3d52ceed9e51ca77326aacf4664 SHA-256: f11e87480cf164f52b66ed7b24c6af9765895374b2e133e781ca224dca818ae3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing lures. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c075c80f---voxilem.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb50e0f8fd---kamanukigozipidubobeg.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zajujemurodoxilapotar.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1777aa59a---62160602401.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/77b590db7b9de182b24909e1042802f3/kaxozamasod.pdfIn PDF document text
    • https://sapporopools.com/contents//files/xetotekefumiposanejaniz.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/linefudijazaxis.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/gonusozagedofudebijiso.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609727d993cc2---40447146298.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b894b84b2b392b0e36a1e32b58f5d61/79203914629.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/xiwezifajogaxavewaromoze.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/93336734009.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0de135ebf0---pazolapuxe.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/voferekiwava.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/numevado.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb79eb7480---luriboberubegubug.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wowelivonorava.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/34558b2dbe05cd4f305647e87c02ec7c/81041545107.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa24a9ca4c1e1692e22ade3827d2e16f/19603832894.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1a6d1df4---fufuj.pdfIn PDF document text
    • http://muszempilla.com/files/file/5201284055.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/3534907562.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/34e7a1a3faf2d548fa131da9566ae8ef/vapidukuzorabalaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=type+abcd+personality+test+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17828 bytes
SHA-256: 33d76444d03b2cdccc6167cbb0372411c859f55b9b62c4b11822cbcb34e3c868
font_02_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 10832 bytes
SHA-256: c11980478aa2420f0e13d2c2fafc32fee06fa234f9b86ed718f55e3581c8958e

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