Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb978f752c7711de…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 12:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12ecf23bb029b617e1fa53428ff0126e SHA-1: 856f83d9392b06ad848623cfe98d8c1e3a679b88 SHA-256: cb978f752c7711de1f37f5b93d74d4daa264ee16912e103068e6a605d7217655
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=how+to+spawn+cyclops+in+subnautica PDF link annotation
    • http://podushka.by/files/files/temop.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16203147280768.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/87710619355.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210716152643_911314656.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868de505a13---80914751488.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2377874306114411c8076b.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n709tgeq3909i6jh8uo4k3q565/77504110001.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210628_AB9F66603C7E4100.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160965985ea8c9---36711059430.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/baxadebewurevu.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/zimumimadoven.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/462367265.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nejubulaxemi.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/bokodef.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe93d39646---57407493521.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607881959f7dd---49351054118.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/274750925.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3433286e42---22186756154.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c22b6ac39---jipojuledururamoxukavofit.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/347fe5215564b20953049e91bea5dca3/38973883027.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/65507734638.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tcpk6pfug8an3mthlgm512vr26/mukiwetumenujax.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/42066522789.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
stream_005_off0000e331.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE331 17520 bytes
SHA-256: 3335946b8dff70f461f03cd183c3d3a2b3baeab8389770959a5ff3b1624489e4
font_01_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 10568 bytes
SHA-256: 8924381bf1c8a24fbba2b3d17f68f5b9ad4399a2a44d56c2e00fc9bfeb9f48c4
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1