Malicious PDF — malware analysis report

Static analysis result for SHA-256 473f278fc896526e…

MALICIOUS

PDF

84.5 KB Created: 2021-07-26 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7331924f5674fec9e25c8417677da36f SHA-1: 0048c1d04bef9193effcd6196645a3a58a474d63 SHA-256: 473f278fc896526e8ad3d221d4c72b7adebbae0039b9611d054abd5d393e1480
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious URLs. The presence of numerous external URIs and the nature of the detected malware suggest an intent to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51f21272c7dbf7e03011c9e182d46a23/12072903649.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/nubivefetekimixel.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/15501037768.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/fapan.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93c4e38c2a948847c694ba1c4a1c2efa/diwutusuzowudiwigo.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/bujuzitanofi.pdfIn PDF document text
    • https://ultralloy.net/upload/files/wabigaboriga.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eg61moa8tr2ld74molujs335nq/69654002773.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6ff829f6---97949034295.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609a373f90aa7---9201340390.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b72b87afa41b32caf3790310c4b75b79/sifirin.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d0vop8ldut9nr5q0ais8os0rgv/11498075416.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/71712823699.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/dijebududoleludona.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xeruxizunive.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/rkde1tach2fudp10pld19p2ri7/bibipepu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bki5ek43781u360qt44f2lcai7/ragifigefenepajur.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/42359219916.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/49729634841.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39975384587.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/57040387241.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/fufadosezudofosinomibaja.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec89a59b6---25252227622.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/bedokijuf.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/88335791773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=airsep+freestyle+as095+manualPDF 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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 17256 bytes
SHA-256: e775280d7c44114213ce0eecf076fc41a0d6c5075397d17edcc3641d8d229605
font_01_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 11016 bytes
SHA-256: cce018db9e2210687fbea70582567544256b4e6e82a0140e7250b957a8805822
font_02_sfnt_off00012c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1