Malicious PDF — malware analysis report

Static analysis result for SHA-256 169cce01abb4f2a6…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fcf98d836f85b1bb942d9093a741ff8e SHA-1: 141a3dd407c06a1748f7d8ee982d4f40e190d65c SHA-256: 169cce01abb4f2a625745cdaa661815664cbfcca0c240517583c27f558412fcb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://synerhu.ru/uplcv?utm_term=manual+of+critical+care+nursing+8th+edition PDF link annotation
    • http://fioredda.com/userfiles/files/sipesudolabezadizo.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607176951c3a9---bixiruwebefepakosigife.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04da9368ec---45021454990.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/dobevazutipogufunutewunim.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/76911229383.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xejodagifumu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7bf624e10---29078923924.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6c4be8a5cebf9bfae2682c0f16566a11/wakabepesafoxem.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/zopukalijatipi.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/3191759344.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e0d68329---73319050278.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afde9ac7d33---dilivuroridojesera.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/70211375462.pdfIn PDF document text
    • http://ezibra.pl/upload//file/fizenefuwuzazufumiku.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/97953559985.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2653c52c6dbc5e3e163a15c7049f6016/pezakebujinilokexeworekej.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62b8e0636---wixivodan.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/64964117579.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nesawotetutaviwiwazadu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/61900080613.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/joninutu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0f5db7766f05541c07b0f1fa97d937bd/fowapumanoxab.pdfIn PDF document text
    • http://8njl.com/userfiles/files/fidinaxulukumafij.pdfIn PDF document text
    • 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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16864 bytes
SHA-256: e3a62c95e404071d61aab1c31266578dd32bdfa29e3337b74dae2dbbed978bcc
font_01_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 11056 bytes
SHA-256: 0aad21d465283f2112e10de5f146a91a372bb64b5248576afb48d1d5bec0ea0f
font_02_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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