Malicious PDF — malware analysis report

Static analysis result for SHA-256 881e350aee76fadc…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 13:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a06600a64999732ec207578f4f79c2c SHA-1: 4fb22a9aaaad8b39609e13fed5e7a7cb40a34557 SHA-256: 881e350aee76fadc3837031503aee9b025103b0d0f6c81c11b1594d2c3ad89ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URIs, including one pointing to a raw IP address and others hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users through malicious links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://123dvere.sk/files/file/51264320876.pdf In PDF document text
    • https://eslms.com/userfiles/file/48903571314.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/25917479889.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/29881833159.pdfIn PDF document text
    • http://elitvorota.ru/f/file/5937217555.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • https://tuinvandecruys.be/file/798048505.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/xexaw.pdfIn PDF document text
    • http://wirheiraten.de/images/file/raxorisuxuvopibaje.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/suvoxomizege.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/48782244007.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a535c01---dipebigixixerenoxusekoji.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/22232125901.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zuloxoxikerefasozoxuno.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/7630492733.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8aac52f6---29374082769.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/roluvekapogupagikurema.pdfIn PDF document text
    • http://newmob.it/userfiles/files/jikan.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/venijitexutuloruze.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/naruwovim.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/liwuxewidepijemosose.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c209b4d1---55630763320.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109010458046194.pdfIn PDF document text
    • http://hanifeugur.com/image/files/46235899151.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/21623076773.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=transferring+all+data+from+android+to+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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 17572 bytes
SHA-256: c807e74ff491ad2f7d91e3a55dfe115136b1f7c8138b9589a50aa7eab45c1cce
font_01_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 10660 bytes
SHA-256: 0483b54175f4a6070a5fce2d29430a35b53cff5bba99e7a17ad2d64610c0c3dc
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1