Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a172600be00aa7…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 20:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8790a26e8cd510cc3793b804be27fa39 SHA-1: 60cd587000684486cc2f639c2a8dbe17bc5e62ec SHA-256: 84a172600be00aa72f5d0565f8f2587df70189368d72228ee45870c120e121fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=install+windows+phone+apps+on+android PDF link annotation
    • http://geoodwierty.pl/files/file/lumexofuboxowizojugag.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zasabulaguwariwifijutinij.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/29856965052.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/35693691593.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/80439145382.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/42314168707.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de02231d26---fatukugedatevunejugegapa.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/91713027812.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/45202870005.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cgop4221vp2p93cpn2u82id43j/tosezek.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912044351.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/kagebuvekopezajox.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kefamivudegare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598c20eb78---44666950166.pdfIn PDF document text
    • http://arablift.net/userfiles/file/tijatevijiserojuros.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/sexarivemisaxogavob.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/38348777149.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ditawuxiniguzazu.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/jifanu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7c73ba118---98590535234.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/gidotejokazip.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/jetave.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xopisiruf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 10528 bytes
SHA-256: 8dceb8ea97b2c8894e113964057d3cc8c550f82301191598f0cc2b06f5314662
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 17908 bytes
SHA-256: be71133d4a18f3de047109cc26c9ba82b317df31f10b529ec19c26454b719ef0
font_02_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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