Malicious PDF — malware analysis report

Static analysis result for SHA-256 125cad11ca795e95…

MALICIOUS

PDF

108.1 KB Created: 2021-07-31 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddc5c4f09dcae811a83e06bffbab5520 SHA-1: 2c3474f372504db3807d8641af5ac3ccaf0e6211 SHA-256: 125cad11ca795e9551b94f0514715530edfc17f19043bca62fdfb12446381703
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://heatingboiler.ca/fck_upload/file/fezuwarakifudejezabo.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d4pdr5b6nt1s1lcdc9fcgn0o57/30200533666.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/75373819505.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a55de917---29238217621.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b70298bf---vevosatamuk.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/wavutekujukudiwoza.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/42ed4ece5a9aa47d3bbf2e4ce602b196/banitukomomisi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/podezefojuno.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/zamidiwoxezageluxu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sinimejuvelenoxuzewasi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210727231740-64913054266.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/848611ec5d628bf58f0aa6c894ac49d7/89963346393.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/90741281908.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/20042507895.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2497fb08c5---35587253275.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/68043717168.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/25411580852.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/043vp3uo8aah090kb3evvog8k3/kedanadejaxad.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/40198955591.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/12240968677.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kavoroxovoxosup.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8bd22fd87---vufazupezukevo.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/74404691854.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/novekulan.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f788d25b3---porubagamit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+drink+usana+cellsentialsPDF 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_off00013f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 18676 bytes
SHA-256: 3cb847ff5b3f8c5fdee950b1fe5d2c807f768cc9cdbfa2e250165793d09ece42
font_01_sfnt_off0001708e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708E 10632 bytes
SHA-256: bb0eeb8162a4070e15f0622341a1c8b52caadd35e0c85a7c7fffa20af77b24cb
font_02_sfnt_off00018909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1