Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f880c67ded848e…

MALICIOUS

PDF

71.4 KB Created: 2021-10-10 07:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f253cd8aeee584c9343f856b254d9c27 SHA-1: db5de0b9efa9811c2ea503d54ad4a6bad58d8c2f SHA-256: 81f880c67ded848e98c1ae2c1376277402761e60f95db680f5b8dbfcc570c345
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs pointing to various websites, many of which appear to be compromised CMS upload directories or disposable hosting. One URI directly uses an IP address, indicating a potential attempt to bypass domain-based reputation checks. The presence of these links suggests the PDF's primary function is to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://pistant.ru/uplcv?utm_term=pvg+32+technical PDF link annotation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/momurur.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/zirutowulokakev.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/fiwurutol.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/88158718808.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/66266603714.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614aed87acd03---naxizodetixilovili.pdfIn PDF document text
    • http://moristas.com/userfiles/files/97070321544.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20211007163738465.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/figikafakogi.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/lufetewamitotoz.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18557734601.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/mesobazebupivo.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/47965064416.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/79548444788.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/46073706521.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/juwoxitibewokonax.pdfPDF link annotation
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/tusejoduni.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/lirupifab.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16153f428e7c34---12180161680.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/4663263198.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/bexufifekuxeju.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/45566121370.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/7c00621f67388e892bce56014b0193c1/27722348767.pdfIn PDF document text
    • 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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 16448 bytes
SHA-256: 77abb9e0966c5769a8d604c132b7af03af765eccb50c68f40dedcfcedd50f57c
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10480 bytes
SHA-256: c25130abbc17239633dc5ce7218c81cfbaeade1cafae481e815a3c782ba7b9ed
font_02_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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