Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea25426b5fd45168…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 02:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce1ea536c2c79c05eb9f5526703072d2 SHA-1: 89682e5d37661b89ab9980f49c6e420a21fb7651 SHA-256: ea25426b5fd45168b77d5fc48fbe3f344792f9c842b14e9f4c9bc4e695b5fbf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple unknown domains, some of which are hosted on compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fde1b9d3---zesoxofazunofimajibuvobe.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/luguvowiwukobe.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/zopedumikugibem.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/mikaf.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/toruvewegutusevugo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/71087215195.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/lumixijabak.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pujudefosaserawejew.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/dcf150f4ca82f00d147e63c55945bab2/61843631672.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d11bab475---42567868823.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/96874239313.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/novewugulituxetawa.pdfIn PDF document text
    • https://lapakunited.com/contents//files/xelobavujeluxowesipejokun.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/44628240008.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/rib4foljqarmvqsddjo4hub593/jovoxaxomemafeperax.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/87946278516.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/98199939706.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/25829767241.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/xabavebaxegibutudadab.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/filexusabanusumonisenowow.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/11566518462.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/33961217910.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pugevisodilijof.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/busedinu.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/36522560267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tamil+books+online+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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 17532 bytes
SHA-256: 4dcb04b437dc7f53433f065ae80f9cf45e70078a6150b92edf36e4f409e73d9a
font_01_sfnt_off00010d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4F 10656 bytes
SHA-256: d0d65f799fe58a8b23ae18bb7758dd347b4fe33b859144188579fe16ec6545ef
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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