Malicious PDF — malware analysis report

Static analysis result for SHA-256 a175a5a72b856592…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 13:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f6daab887f30a10dc5a13fa4b13a32c SHA-1: 7a700c6bbe619daf7e9133dadc18fe9a685f8888 SHA-256: a175a5a72b856592f87e41a2e36df2fcab59529144d747d400108f76532d3c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. While no scripts were explicitly extracted, the nature of the PDF and the presence of numerous external links suggest it is designed to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160733e696d685---61057586027.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/397162796b22742aad31288519645dd1/24602985950.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nujezogigunumutevexizopi.pdfIn PDF document text
    • http://airmon.hu/images/files/88569385592.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/3325776571.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b467eb109802cbea31cfed4a8546301d/pukusifikepanure.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/84457682156.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5blc195o3hcdu7pb3pfnvp5601/87416978753.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/59583355386.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/42238033025.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df80e692---81128605426.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fff039519---wenipupajiwubebavonajudo.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejotetijerufi.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/11661769741.pdfIn PDF document text
    • https://mashura.co/userfiles/files/zenadurizupitonuxaniwapos.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/1ib1bq88gfud5gajptvqevd946/50831006097.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc2566067---70135202122.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/14270980713.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/nimufi.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/75931480233.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7h09siida8iafphu2kmcm0ar69/raxuwixapazimufanepib.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/350eba36347ae63b791608d9153b6abe/kumejafilomevifete.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/sasivalikevupopovob.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/88029794413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=today%27s+punya+nagari+epaper+pdf+downloadPDF 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_off0000c29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 19968 bytes
SHA-256: 070d5bca5f9fc1163125f2ca24ba41a0558fe2c28fe6592a97de644516ba07b8
font_02_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 10872 bytes
SHA-256: 96dedc7eb6f0ebe1fa9c425b3188e251f440c29c8e3bdc8162f03b636d9c0936

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