Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e8718569955c3…

MALICIOUS

PDF

75.4 KB Created: 2021-06-25 21:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b219ab09a74dd6474d6893c2ae207684 SHA-1: b0d0ca0399ece1737f7fce0b327cc78af45ed230 SHA-256: 953e8718569955c3a0fb04bca4815f29a08d4c52c53d6ab3fb8a321b2aa68f8a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aweibel.com/Photo/file/gikofuzebinerevipilajige.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e56b3592c82608fb38c369d42204665f/kutukupo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ff8a75e88fc05e77344f375553ac4923/kebin.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/26b9f219a3aecb63b91cc4c6e9df08e4/jujoxatimiw.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74f1192ab---63797703907.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ae7c6f9b---29610312481.pdf
    • http://uleshuzatshop.hu/files/file/gijezomebejufen.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e0872201---20273679946.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160847f926f278---42053383642.pdf
    • http://laclonghotel.vn/upload/files/bizozimapupipexega.pdf
    • http://feast.to/upd_file/71783138737.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4f52d381b---48439918738.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3eabc101d2de1f846a26eb14d902fbfe/dasulugovomosune.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/muxajedeputiwaxizufaber.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f17d5fb17---terinarawupubegiwusolam.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/80ucfobigitovf0trao7hfembj/tikazafumalabofopusuponuz.pdf
    • http://aldara-latinoamerica.com/userfiles/file/suguwawazafub.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/18hgh3tieitennqkaf5chtkflv/6854381442.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc447f44eae---28177933179.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160705a66a00e6---nimuxovenomixis.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/gapujibapuxufomobodizox.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b171f184---pupazajiputup.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b97d4701---33286742215.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc7a32b96b---80248772656.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+feel+fine+anytime+she%27s+around+me+now
    • 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_off0000c2cc.bin
64a61b6a6e237cdae3d4ad490ebb0a4030299f56c6b8a17ea5d3a8cc97e29ad5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 17596 bytes
font_01_sfnt_off0000eec2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes
font_02_sfnt_off000106d9.bin
060de5707947e17148f6ac9eecc5abfacf9cf86697124039a2302127ae6c04e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10904 bytes