Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc414f6d542b6b02…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 20:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0492a8399fb3ebd8a7d0f3b3414abc5 SHA-1: f665c6d7f45d672ea04ed1916563db10931a4bc4 SHA-256: fc414f6d542b6b024b7745602845c0840eba098ddb5ab3b8da829e796eb34d69
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://goez1.com/10005001208290177/ckfinder/userfiles/files/nenikumuluwunuwarawalamut.pdf In PDF document text
    • http://lafenicealcamo.it/userfiles/files/fivebimabewinufubaj.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralugadirojipapokebimema.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/96217659815.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/wugek.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/nexega.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/94374869548.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/10947856797.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/mubewe.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • https://ocw.tw/uploads/files/16922385858.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/30905217252.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/54222800795.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/16722855630.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sataferukutedajeba.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/20088166798.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/1399264549.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/pulaworarurowulosagorofep.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341df121e8d---rijudekopa.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2b8349a0ec79a0ebee032ac988ed4fca/vodinawexegejevezere.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gixusimiruga.pdfIn PDF document text
    • http://planbmedia.hu/files/pudofebelali.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0d25dce9a387bb9ad39a7d42de6548d8/sagisalufuxeg.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_050200.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/xadiwikuzetobabidis.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/dosepebijurigoxusif.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/92488109517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=corrente+alternada+e+continua+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 18288 bytes
SHA-256: 07b29eb2d8521bed9a21af238ec18e98986b37c6a281024db9513237aa1ac911
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10576 bytes
SHA-256: 1115f1e8b782a855e5dc59d8e769c3ae5d3eedf83a2c44a188d6a838e1792b2a