Malicious PDF — malware analysis report

Static analysis result for SHA-256 378fb0bea5cb2d7c…

MALICIOUS

PDF

68.3 KB Created: 2021-10-03 14:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0001aee4e7d9ec2093f86da892f5d77e SHA-1: 230a3c15e28e302893a53f2ce782d3d8d650fadb SHA-256: 378fb0bea5cb2d7c9f708cc6da3990e22ac7d049b0b0ff311ea716725d55199c
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=cleft+foot+types PDF link annotation
    • http://naphotelbangkok.com/userfiles/files/wivelorujuvamekuwosisiw.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/34759199315.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161439872efaf9---burumi.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/sufulusabeveroga.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/28476458242.pdfIn PDF document text
    • http://newshop.jp/archive/file/13223934195.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/25583136225.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/859e53bpid8kavukgjop9qctc6/defuvizuvazuvikiris.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/89856599180.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/kufidid.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c673929534a3b150a9a8461318e195cf/varosunufano.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/visudilivarelatuwik.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/vuxuzumupob.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jawesosowomemizudivubeg.pdfIn PDF document text
    • https://norservis.com/files/files/20634651926.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/mavij.pdfIn PDF document text
    • http://mylodge-naoshima.com/fizivijakinu.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/71871637392.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/pinifezexomuz.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/71082055378.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokalebuxifabixug.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/76803255189.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/84418210564.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_off0000ade6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE6 15708 bytes
SHA-256: 56aa6ecd0e518d0ab2ca0f4d5e3a28fb7a269c8c0874515f95c97f9c6342a310
font_01_sfnt_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 10036 bytes
SHA-256: 12340feebaa71eef35cfba56f19473ee7a7f204eb9826842d7a6b8f9c9a990c6

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