Malicious PDF — malware analysis report

Static analysis result for SHA-256 7215aab9decaf2ce…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 09:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffb85fbebe79eba861b0dc4e939fd0fb SHA-1: ccf3f44e17079372ba3aa57d3645fe16c704993f SHA-256: 7215aab9decaf2ce1201651f470f25ba4fca486b9c4f6f537945ddebb3c74047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or phish for information. No scripts were extracted, but the presence of multiple external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://weldingportal.it/userfiles/file/71005624120.pdf In PDF document text
    • https://satbietthu.com/luutru/files/95033417719.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/liwekosafosagigiz.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/79542331026.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/tasipabevadugupobudogime.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/63323897695.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/79734785376.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bijivuvuruzavagor.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/befobivik.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/50108134993.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/bevubeweletofun.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/44865942758.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2299983456.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/38575278352.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/71335751384.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/80937697974.pdfIn PDF document text
    • http://btfa.tw/upload/files/75528664210.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/nenezofapivaxigededijano.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/1a6124debc89b95ac0a7dae69e0cde6b/89261129703.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efefc115d8---42989164665.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/74365600636.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/70841002961.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dc829636e480768b18f46cd4435bad71/nitedamugelatugidop.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/zosidumukedazegezolofep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+house+party+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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 19160 bytes
SHA-256: 5bb664f4a834e4077bcecbe9244a0cf46feed743929c0828334fd00794aa779c
font_01_sfnt_off00010937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10937 10792 bytes
SHA-256: c7ad2c8cf4dfc528b07f784d92911a89939799e82dbe33fa76f695433bf08e57
font_02_sfnt_off00012222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1