Malicious PDF — malware analysis report

Static analysis result for SHA-256 862de630f0bdeda5…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 04:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ff0055f324e7c1905ce2a89c0313e50 SHA-1: 8ff48988ddff28de90afcdb442f9ebea65c06145 SHA-256: 862de630f0bdeda5ffae153195b2defaf3c52312767905faf60e027748a24f3b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs suggests tracking or campaign-specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://oniceh.ru/uplcv?utm_term=ios+photo+scanner PDF link annotation
    • https://kolbandibileklik.com/resimler/files/41208497925.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/96006266363.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/13811510787.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/50333958348.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/xixisukonamelo.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/33210549799.pdfIn PDF document text
    • https://izometal.net/mm/file/55041728761.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631971823lakanitewobokif.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/bagopejusaxurevigo.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/pukeduvivowedigiw.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/83707874764.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614806e18fa91---pixuwinivodekarovuzebit.pdfIn PDF document text
    • http://quetthe.com/upload/files/buvujafogimogubuvatik.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/99402073569.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/pajoboviseni.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144c842c558b---viwaxozizibapov.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/98283512127.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa7ca62674---18466453590.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/6066427420.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/7258494427.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/26434298637.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/75720091397.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d54b7e10f2102815b10df423fcb89600/wojorinowanak.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/59998186314.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109092200463560.pdfIn PDF document text
    • http://mosjob.ru/images/file/72954900379.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_off0000b573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB573 16372 bytes
SHA-256: b9fb72e45df0cfbc43b7c9a647f14216fe30acf0ffe5214305df2a335d95bed5
font_01_sfnt_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10284 bytes
SHA-256: 94d778511f04afae5744fc47e4f304a8128976a4564656229b871fa0f062b238
font_02_sfnt_off0000f6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1