Malicious PDF — malware analysis report

Static analysis result for SHA-256 454ca466de1c940a…

MALICIOUS

PDF

80.3 KB Created: 2021-07-18 17:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89eb1da55bf7e2c64f614a5fc1da7d6 SHA-1: 84701fc82d420eb11ffa0624f8dfd6594bb9845e SHA-256: 454ca466de1c940a5da08ef175f87ca85e3df26ff8b74f85ed5c15eaccbe7b12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classification strongly supports its malicious nature. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2hk157svp7787q06qrog8gua3s/68881082873.pdf
    • https://hophamthaibinh.com/upload/files/puvukomamulef.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/27e6deb572206d86abe7199385558778/kepajujidisevezujiwad.pdf
    • https://eventaipei.com/upload/files/76778527441.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/10066d87de57ec985a435b43584bc9ab/reduxiwekigawapitavonit.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/osrfgi77dboi8o3m4cktsi9br0/galemulem.pdf
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/64521533618.pdf
    • http://kadh.kr/bobod/upload/file/keworosepepo.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/df1e5c27c47c36e97fad91f0bec032bf/sunep.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ebfb2954dea6a0e0b0493dc8d37708f/53828071401.pdf
    • http://alexandercdg.com/clients/36029/File/81590801356.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49532078dd---65368401944.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f02784b164f7a4e718cfe89a69e0c29e/sigeposibarakuguvorosu.pdf
    • https://drivetripper.com/userfiles2020/files/44103055410.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ce614bdc714---13163047017.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bd7fc31---senubonosisemup.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2cc1f1cbce771f54b1340110c718cf98/sefig.pdf
    • http://budka39.ru/files/sebaroxuwevupexufegodovoz.pdf
    • http://avision-italia.com/userfiles/files/87084576183.pdf
    • http://trunglam.vn/uploads/userfiles/file/48610946541.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6a55820440389419c091cf07116ce639/vuruvegipijavidibonuzipu.pdf
    • http://firanywiktoria.pl/uploads/editor/file/lovukafiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+little+mermaid+2+game
    • 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_off0000d892.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 16792 bytes
font_01_sfnt_off0000f0a9.bin
a71fe8fb41aeb2a9d25d6578e3c277f41dcb06dd624f51c49f0b92e2e802e6e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10388 bytes
font_02_sfnt_off000107ec.bin
0d2f079784352193e4d9084fb207a9ff4c1ebdeaf68bd9552bb2a6f938872d55
pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 17024 bytes