Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dfba8dc8def4bf…

MALICIOUS

PDF

126.1 KB Created: 2021-08-08 21:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13a9a4cbfcacb66fcb3a7a0eb6a7406e SHA-1: 214b82817fba55b2df6271b77d9de926eb0c16a9 SHA-256: 40dfba8dc8def4bfcca5733eb3df779df8449a9746138ead2bf43425084da247
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage, likely intended to distribute malware or conduct phishing. The presence of many distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de833df6f---gixaxepuw.pdf In PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/53111118213.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8ee8540---42931359211.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731ca592556---rigajuzifudunedebepa.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712c92e0f73---47915393619.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/gujud.pdfIn PDF document text
    • http://sinoorchids.com/image/file/30572310585.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/mawapakutezugumiladav.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/66915506115.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160758b694fcee---72321690747.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f25114cb---rijatasibunajuloxoduje.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4194c1eeffeb3006520d6e00fc0d6ff3/32769231747.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/38449251718.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160821274bd65b---86354142164.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-16/20210516155734598442.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160782bff7b5fc---62158005580.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/velogidumose.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0a5ff38c36ef8722ebb3a1eca194ae67/motajesakeselofi.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/sagiraxo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a472604b---tudisozubuzupuxapemu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/4614012944.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/19bc43557cbbcba537798e04561a1a42/47362216217.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gojefideramesogodaper.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/14717928920.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839080b029e---webobumirabomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=keyword%3Dgarry+kasparov+iqPDF 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_off00017e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E75 10860 bytes
SHA-256: 016db4ac8461e6107cbee58e73c84aa9ca7061f5998ee64c78e36852c55c9c6a
font_01_sfnt_off00019744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19744 22180 bytes
SHA-256: b86baad70b2fee89a3c0977c6d9172b4f7a822529196bd1708b8e40920d7217a
font_02_sfnt_off0001cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1