Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64046cc4ac93f75…

MALICIOUS

PDF

81.7 KB Created: 2021-06-30 12:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c43436dbbf6db05ad7be98e6ae2457f8 SHA-1: a5dfd1fad114fbea69fc2f377106e3e2628b13ef SHA-256: f64046cc4ac93f7586f59158758b9ffca8d58d337bd29a8563e7b775cc452f74
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://vizugy.hu/uploads/files/kujagizagovuwudizasinin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bd3911d1---tibilapifida.pdf
    • https://banghenails.com/upload/file/xemedipavizogosijamij.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/191f8db5b356c1c88bda9c027c086f8d/guzuwezoxutadimonito.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d0406ef3cc93914b68771d5074335123/68130846577.pdf
    • http://centralcogtc.com/uploads/file/58388421506.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b8d16631---58126344954.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905a3e5895---golisegotagesufuvezizeb.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/lobozixilazulifija.pdf
    • http://mynigaoe.com/upload/file/20210629051500.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/av0rudb11udi9v73b6o8r3had1/viganedirumenafavesuwup.pdf
    • https://rijst.nu/userfiles/file/boturawafezakaxebapob.pdf
    • https://lapalettedesarts.fr/gestion/file/nipufaveverevajuwe.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/facfjt1lvpciqglcq7ih7vvbu5/mukugodigebolezitot.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4kefb638o82tpr2o9sob3uafk1/bisojukopafofinezisevip.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0bd7876ee---zubelokudatudez.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bdeb3f27---28485465214.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9e005be7967b68ea35b59422b49c9d14/silopabuludalumovi.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/be680c251ba27865343e7e57437fd3b3/ginifugodilepamofedem.pdf
    • http://forter.vn/hinhanh/file/zulomikamivikotiwi.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/15800fe64978bcb5abec49f6d49d0b6b/48626384971.pdf
    • https://atl-50.com/files/file/tokatovepe.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/140853465e24a9ddf3045af2c5f0a691/35360997999.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b551fb90e06---riwozazetafikobafa.pdf
    • http://dentalclinicbangalore.com/uploads/65241690350.pdf
    • http://cy2hand.com/userfiles/94784257716.pdf
    • http://weifong.tw/fckimages/file/nibegupuzexiziwegatewu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=3ds+max+vray+exterior+render+settings
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db97.bin
b45f82d8ed173e165af9bebeca2f14d0aee23700c171791c7dbb652118830d8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 16968 bytes
font_01_sfnt_off00010813.bin
fb59a45e85b5d91124b6d756889087345f7d47eff695f3e08adfd40a856a7bf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10900 bytes
font_02_sfnt_off00012126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes