Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5b4ed31dfde4d0…

MALICIOUS

PDF

93.2 KB Created: 2021-09-24 09:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f0caeb48a5d50e55cb461b0e3b42d90 SHA-1: 7a7cbbff908a02d4c4a98060fb97e8208c25b724 SHA-256: dd5b4ed31dfde4d009f1ccb813761053c2e6af6add091e37c20f53e0ab9bf390
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting multiple URLs that lead to other PDF files, some hosted on compromised CMS uploads or disposable domains. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context, aiming to trick users into interacting further. The presence of numerous links on potentially untrusted domains reinforces the phishing and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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
  • 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.
  • 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://votejoedestefano.com/editorData/file/23753496145.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wosejegudenib.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/ropasilusulumul.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/52632600356.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/19805698886.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/72499863987.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93776588423.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/potelogubumaravu.pdfIn PDF document text
    • https://anakmeong.com/contents/files/5454454367.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/83398150817.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/70500872473.pdfIn PDF document text
    • http://fkhd.cz/data/img/67006640277.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb1b46b06---luzaxojubawid.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/tixitirisat.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/51923212411.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jamatiletuxaju.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/33948132909.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/17628668176.pdfIn PDF document text
    • http://ativn.com/upload/file/begipavuvijome.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/lamifabusebubonedupuj.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/01cf8c0932baac97dc9f9e9a33e0e5a5/balemufunusiloj.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/40604944661.pdfIn PDF document text
    • http://brlairport.com/images/file/92518891291.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f070e187be50fa062d64180cb74ca253/gijavodoligedapamimisadup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fifa+mobile+apk+2018PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 2128 bytes
SHA-256: ea0838c56c771baac3e7294113a37a869da30c0923c5234740d3ad99157bc88d
font_02_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 16232 bytes
SHA-256: af293b2b60dc5e826b00d8953dd18f37a59bdd939ad7d7593537948814e7f124
font_03_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 10760 bytes
SHA-256: bb93488da266db2536b1ba84274d5cd7cc12d0fd708ce7289561651864612a7f
font_04_sfnt_off00012c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C73 21804 bytes
SHA-256: 0264dacf9f0425b96355d356faaf22d67b0690372e0f5c679c4ac6d53cbb4e7a

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