Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2423c8242e6a10…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 06:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22a36dec61741a9293354566468880d3 SHA-1: 26890079ca9ea5329a28bc965588e7ba1051ceb2 SHA-256: dd2423c8242e6a10ab895fde6e08751cd479ca02d45702bb2f127262a1781527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5165ce23b---xorepubijekanalanovumox.pdf In PDF document text
    • http://abpaluso.com/upload/file/fufowopojoxewono.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e513b340b6e66dec373a4bedb3b84dfe/tifajodagakimizibose.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/71367234934.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b228830ac---tiwoneru.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mexirebusidalupejexidalu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e8c7b04d0---lepuxivozu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/mapuwidibufufipusibexixom.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099406f86e77---dovitodupozutejezilodef.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/81354291166.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/duwinun.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pososamiwuxedojiporunaja.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/6119324450.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/52404642800.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/69253175425.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/12641314919.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2d990bea---16803968994.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/32044297098.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/68134982836.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/19541779385.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/51370559816.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7a58b9d090205fb84c4f1fc5903f7652/84855346597.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8c16c6a87cfd3a25f0108be37fb64df3/48158131198.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mubelodiseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+history+of+integrated+development+plan+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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11088 bytes
SHA-256: 8c8e3bb2bc5c194cbc504d9973e18a55e4794db41c6d300148033b57b40e20e5
font_02_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 17468 bytes
SHA-256: 1afffb365658cfad978eb82abdc2fe8b870d081565743a0bf8f5230b0b2f95fe