Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce8591c50611890…

MALICIOUS

PDF

80.9 KB Created: 2021-07-01 17:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63130c79eb772a27629811c54086a912 SHA-1: c86e0dd537f39571ff317b88b0d3497d666ef869 SHA-256: bce8591c5061189084ec782e97b4004ba9d66d80609938e678c3afab18e0ec2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The embedded URLs and link farm structure indicate an attempt to direct users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=hymn+for+the+weekend+alan+walker+remix+mp3
    • http://amdind.com/userfiles/file/vejipipukezojijiriwivazi.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160adba4ded4b1---nolulawi.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/sudumotironarinafalil.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68214bc3d---visugezerotezonimofezumo.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/m7af2kstofirh8dv8bhko5sjbb/64790822744.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af2d0a538---2924633931.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/055f634d53248a8e63a12020268bf5f8/88145527493.pdf
    • http://cyuanmei.com/userfiles/file/55700732257.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pc3s8c6r9u9bp1rcqn3jr05hn7/lubipawubomuzawogosug.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d7727419---betenifiker.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe3422b0---gekoxenatajigesatodavug.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d2634bcf71093572702090bf87ab41ff/lirotenixezogepokax.pdf
    • https://stratasphere.online/userfiles/file/bajonig.pdf
    • http://essiac.cz/UserFiles/file/jidabametofixob.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ee899049---jodawojetolizaladuvurufi.pdf
    • https://avela.md/userfiles/file/58256054517.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6f83c333753cfab0c6fd79eaf4493491/49664862003.pdf
    • http://midel.me/userfiles/file/6767638874.pdf
    • https://webmenuplus.com/images/file/fexuxojotixadasoz.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/51022664615.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed4c60b99---ludavoji.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9a367e6e3a5f9d10270efe9c65160ebc/vulade.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c45d.bin
71b3e8dda2322d80c38537cc78274af2bb1b7792040384e582119762f64839be
pdf-font-stream PDF embedded font (sfnt) at offset 0xC45D 11152 bytes
font_01_sfnt_off0000de3d.bin
4be6ae45e669f46747d6fa0e970b66b5192292f8fd15f3c14448610d5903d813
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3D 24748 bytes
font_02_sfnt_off00011562.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 1732 bytes
font_03_sfnt_off00011d96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 16792 bytes