Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3bdc25324f52c7b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 00:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c621bf2e467bec72c704c891a0e6d2e7 SHA-1: ce855d4cc754925361277380e059989691753f03 SHA-256: d3bdc25324f52c7b61787e880dbe6f9461b683bcacd1cd51d6c07da67658c4aa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of JavaScript actions and embedded URLs, coupled with heuristics for link farms and compromised CMS uploads, suggests the document is designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pretext, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/rebivijuvopixezed.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/038eb5577461e24e54ffdebe11de0323/31105869949.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838f60af2c5---71978423993.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/36560274587.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/gajamelodiroragufifa.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97c50d61a---54982369759.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/prp23eja132u6aor5p7u2fd426/27182503662.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f48649a5---xoboken.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160765f07a3c30---46042986531.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/48059605780.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9af69e78---detizupewava.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/123df80b66e9f8f7acc86f5dbc0c80df/mazekorogogesapetujuniw.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/mivitozaviwivimozupolo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4334bea86d391b535f120be9072424ae/rumixuxaberiwi.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/wanopid.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f3c584f89---65216145452.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf32b53674---75177869587.pdfIn PDF document text
    • http://cissi.it/userfiles/files/nepixaxe.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/27b026b228f63fd0cfa2e598434c8afc/vezawiwevor.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/24218264834.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/mimipibi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e7ded1433---51253996228.pdfIn PDF document text
    • https://thehouseproduction.net/file/64470995776.pdfIn PDF document text
    • http://digifast.cz/userfiles/51595726022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arya+samaj+ramayan+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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10396 bytes
SHA-256: 9ec218619daea284c1b297c489a27e81171c62f140e2c17412c9a044c071afb0
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 18316 bytes
SHA-256: 80946515f36a3544ce98f616c353863c76a573522271db6747c40b067d36a865
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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