Malicious PDF — malware analysis report

Static analysis result for SHA-256 847324ba61ae2f49…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 04:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da6959af98f7290d1fd3a37522806974 SHA-1: e0d5507c053b67ad8092b4198bf9fddba09075c9 SHA-256: 847324ba61ae2f4936d6956395bc4b06c4a260e814869563c2efa2c977248153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://weilandvloeren.nl/fckimages/roneweli.pdf In PDF document text
    • https://gestionarival.com/userfiles/file/sutozijuzavi.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/12831656471.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/90273007859.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7cb2dcb5dc58fbc5332e26bb0c6e7375/99827234004.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142966a64f20---sufimezolepisa.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/mulamawafuwu.pdfIn PDF document text
    • http://naviway.su/upload/files/20466339984.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/potazifa.pdfIn PDF document text
    • https://2winit.com/Files/files/gojopopeb.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/towevezatogamezel.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/89162475853.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/tunumezemoduzananazeteza.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/pewexovawejodukonawo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/51918759313.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/86171448956.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7fcd23d96d6773ce7ff4baf54fa79110/sukilukudonufar.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jovirikipufosukili.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bac5dd484---459797729.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a954c713d---lisobuna.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93449201475.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134319acc9fd---lilisezusovulaxeriragogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=alight+motion+pro+download+apkPDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 17380 bytes
SHA-256: 61c2b9b1a5453718d7930a1447a130f4f20164327e3f088b364a35bf88a16f55
font_01_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 10696 bytes
SHA-256: e1ce00e316d249ccb2a9885e5aafe51f07c01b64f9f583788a6123dd592f0607
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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