Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5ca14f57ba93b6…

MALICIOUS

PDF

87.9 KB Created: 2021-07-09 14:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7cb45bc7440faad179b162dae93e7834 SHA-1: beb7dbec9b63fd31a35ace55c7208575f806a8e7 SHA-256: de5ca14f57ba93b61cdae1e98c78c681c43dfd2caaa6d1e5c6315c7d3e25a72f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, with many external URIs and links to compromised WordPress upload storage. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=cagney+and+lacey+recreational+use PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8fe703c5b---liviralameguwufere.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae73e97f66d---parenipoge.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/61a309664c336c3f2ebb9b8f44be9bd6/24313572137.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd6001095---bokagikamisafikoka.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gixurusisubomuguzasenexu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d28d91caf---74060855624.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210616094625844.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d62edb27354---877621742.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/gilakezasipof.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/xavofixowabaforebavimas.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff2a1e209---zijebexak.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ad74c597fef---71087932648.pdfIn PDF document text
    • http://wjcopy.com/upload/files/totaxagusuwanumubifu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/568enbtmbcpu5uujp3a6n0tqv7/tukakinuramowotufe.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/62314840798.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fosozemumubajutolidapuf.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/85781369695.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0c040a3d2---53968039100.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/14402947950.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1mkgmv94j69gka63d4ijerj1f1/36470155962.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/24628abf8806b19a9711e13f8d9d4f79/10833181347.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e2e4c4bc0345d1ac0619e5d74a44e23/88376730645.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/63620608330.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/wiwejekaxudusuvibejegid.pdfIn PDF document text
    • http://newmob.it/userfiles/files/gisux.pdfIn PDF document text
    • 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_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 17156 bytes
SHA-256: af808624e86850abec745e005b47053b8602481adc46c0bdaa2e77fe9d012a38
font_01_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 10788 bytes
SHA-256: 38ce9d2b6f8705ce28b435cff3ae435558d0a0bdeb35969b1981d3444eb932f8
font_02_sfnt_off00013a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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