Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4dd17b6d26c238…

MALICIOUS

PDF

88.1 KB Created: 2021-08-11 03:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fec83b79e77811509a328584f6c145a2 SHA-1: 7627cca4fc0c14d3a19508d67124d186ed32dfc8 SHA-256: 8d4dd17b6d26c238cd8bf3f1e528d7217186c531e1f501ac3386fac61f38395c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/pq864dehu1q8e65eo5dpqobqsb/bemalenopuseliletu.pdf
    • http://allnatureint.com/userfiles/file/ganexanotiditobab.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0bb6362c5e067a784a46835ccf13acd6/delonoxekifexa.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607292a8337da---36647434191.pdf
    • http://tuzvedo.hu/elemek/file/25868647591.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9ecf7ff7ad53abf65d68c619a8cb88f6/90024758301.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/66093746600.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/86935384850.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b5332e16501399643be930ccce4fff80/jomidelirib.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/55543035759.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4edee732c---wavugepewupaneroxemuraf.pdf
    • http://santabruna.cl/upload/file/88732213085.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3afb2a0b---56161804063.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9f263bcc2926eafd3249fe055dd791f5/ruzunujonejonogazil.pdf
    • http://zerosquareonline.com/file/8429716272.pdf
    • http://trendybiz.in/usersfiles/file/26603596993.pdf
    • http://teenmag.cz/userfiles/file/68488479664.pdf
    • http://ciccioinpentola.com/userfiles/files/47946608101.pdf
    • http://e-district.org/userfiles/file/difoliminegetugajurapote.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16103e97f2535e---zadetoxoxemewebabokego.pdf
    • http://saltokisport.com/uploads/files/37024456430.pdf
    • http://www.logomarcanet.com/userfiles/file/55925990050.pdf
    • http://polyalpan.hu/_user/file/69312205841.pdf
    • http://www.fotol
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=rca+universal+remote+3+digit+codes+for+samsung+tv
    • 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_off0000f39c.bin
11bb30099a3b52419fb1c2940f31bf6743b2ef202f381efaa70f9142c8553b3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16968 bytes
font_01_sfnt_off00011f70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F70 16792 bytes
font_02_sfnt_off00013787.bin
1163343856d7de391eea11fb6360cd643aee6913c2ee298580040d3d8dfd1eec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 11204 bytes