Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7046b053287c68…

MALICIOUS

PDF

80.9 KB Created: 2021-07-20 00:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23d257280f5693d989147f7bd8ff6b37 SHA-1: 5b11ed26dc723ce619f726014ad67ae4e8fbb532 SHA-256: 1a7046b053287c6822d04ff24ab96d5eb947c8f8c8a5121af7f30a0e8ba59504
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. Heuristics and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure for phishing or further malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bogelaipigeon.com/upload/file/51815986153.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd703144a---zutikuririsasubazog.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/28583553492.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vufefi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdd1bf46b---paxalator.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/83656657063.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c639e819d5---95363694250.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ef6c73e0099b2b53fda95d17b203afc/vedizivapiranuwuwi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ni5g9skb0cb1sdcscrk6kgvf16/33249709215.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0228102001625735794.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e3ff93770243c9ca45fa303601028672/setikofavaginotoladuj.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/efb39a03aadaefd6f75223a90bb67ca3/44974494390.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9gsor0jpvkientbq7g347tk436/1155413686.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/9576615281.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/14415163348.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8426a4694---raduferemebefawawim.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3937fff365347bcb1778dcc1af8befe7/30114777875.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/bonuzudisojanerevul.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/681c3e20f13f2aa9d6bb506a6d71f947/19741992200.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077631e8b60b---kanaresetorekiv.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/69499143894.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/82671940734.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5e9bb471---sosedegikepobanatifevunem.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/7lhoj1ugpa9hoik3tnkhhrgbg0/raribifuzowinofawoxovu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb896a491c---fafefapiguvuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+computer+applications+and+concepts+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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 17016 bytes
SHA-256: 45a7500af31e04757f523a23204b16f8702c876a4b8e7752103a71c69f5aeb30
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10832 bytes
SHA-256: 8a1bab806024000e7c92d02ee5aba3596bc7599d7a329b7554551044009d8255

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