Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0156dfaa61404a1…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 05:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98fda2d2a7fd6e101ad78a01baeac7b7 SHA-1: 2355f7d2613ce5369644ab151e9a7c2849b95bdd SHA-256: c0156dfaa61404a130b4f3a396bf351b8ab92e8a944438b8c224b3a9ff3c2580
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on disposable or compromised domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://h1t-urlaurora1-turbo.com/contents/files/93110298584.pdf In PDF document text
    • https://vanvoorst.info/uploaded/file/dolosotegadofiwotonu.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910174853.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/wojiwizizebekowaf.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/57724795556.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e13008692e---1421935112.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/bujowowabak.pdfIn PDF document text
    • http://bushurov.ru/images/files/30090274986.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/22774022247.pdfIn PDF document text
    • http://bluebossa.pl/files/file/sorafu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/82058221402.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/vqe0sc5746unijt7ufbcnhoqm6/7312010177.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffd1677321f619dbae5a499c2ce01496/55853847129.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/62909137838.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/510698019.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/22967952256.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/somubitofudiwuruneze.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/38795330840.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/zenufumevaloxekawavama.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/vofutesefewajug.pdfIn PDF document text
    • https://onlinendttraining.net/files/65820509472.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/gidajusinavexuduxisebase.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/11584730369.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/dixojajikodaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=arms+and+the+man+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_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10488 bytes
SHA-256: f95d16bb9171addf9806629f6135af3f458293558a7d315429a3a6dbc885f173
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 19272 bytes
SHA-256: 1ba8f5f593bb2cb5391741e998e8ebbbc3025b3be7de145d7cfdafd8e795c601

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