Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e91de05c2a141f…

MALICIOUS

PDF

85.2 KB Created: 2021-10-05 11:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58a2e2774c0af5eed1ef84235baec3cb SHA-1: 3616f08e896c21e21518ee7a9b0cf014db6f2a63 SHA-256: 66e91de05c2a141f68a37a9b2db8cef80b250d094d570a709e0a93d589eae5ce
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 reveal it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c8f3ac544---5604707114.pdf In PDF document text
    • https://jordan.si/dokumenti/file/xemubasoguzagegamovomeduj.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/movadifevakodupezemefolo.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/nunifodunewape.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5dacaf355c5264afe63b6f2aa487060e/nodojubigoxewuwex.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/89791694443.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e874e147a---lewokabifadapifejoziwo.pdfIn PDF document text
    • http://cga82.com/admin/File/memasatofanekizub.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/68084377703.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210917_233915.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/69940706328.pdfIn PDF document text
    • http://cycling-software.com/files/file/suvefozomawoguvazuto.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/21353565565.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb5b08b41---jilejerigeralo.pdfIn PDF document text
    • https://aromamarketing.md/img/files/27785474313.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/sepanafisiwunonakebode.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30788916059.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vomukubazolu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/jukanisasivuvilek.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/bumifavo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/jujumimazozadurowexojonum.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mefimujogo.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/60727910311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=daisy+meaning+in+englishPDF 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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 10352 bytes
SHA-256: 75ea56fff4ec3fe0bbce06ec3aa0f2fc502e68545371d6e1f81ed27d243184b5
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 19876 bytes
SHA-256: f712888363ab3190fabe07ced46a97e7a77ac6102650837122bc6357a1486158
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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