Malicious PDF — malware analysis report

Static analysis result for SHA-256 236f85eedd9eac1d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-14 09:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd2cc3c254cb966e5feb07e192e3b480 SHA-1: ec30f6c179b909aa76d3ed7769319fce7119a48d SHA-256: 236f85eedd9eac1d03889d1bb19e9b81d55b206649e708f0781d8530cd99ed92
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gamax-motor.cz/data/dokumenty/87277615168.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/68801186576.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/53388242146.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/vetovaxexitova.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dofibavakabofanozen.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/pikavipafofereweji.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/enqkph263s3ka2ateuh28t1773/pekudokidizowiwixipiga.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109092332231367.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/vowoxowigod.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/74856112252.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dezofeka.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fixugabegobesaxaxuzur.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/68229785658.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/detajibaxutinekusobosizop.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0399fe0ca0af5ba73b533e1890c94952/witodunafefatosobipidem.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/30375133622.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2edef3047---79771484276.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/jurotote.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613246e4caa46---57138710012.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/45794076183.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=custom+popup+menu+androidPDF 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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 10636 bytes
SHA-256: 88806d217fb4c32a2dfbb45a323eb2fe119988d6a14141544bacf23bce00193f
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 17180 bytes
SHA-256: 9e7f1dd2507228a4d35bcd0d5b8adc706043bd85896b3bd3d8368cedaa82ea2f

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