Malicious PDF — malware analysis report

Static analysis result for SHA-256 9716b75492c5e449…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 08:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4fcb24beebc67781ccfb86142d40211 SHA-1: 0f63835f92f87aac8525b70014360b6f4ca08cb9 SHA-256: 9716b75492c5e449630e2f8dd546589354bd191e8fbf36986242ada3796b422f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack or a phishing lure designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60497c4ba2---71056616323.pdf
    • http://allasclub.com/campannas/file/95485216880.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3053a2acf73aae893662618c1dfc97dc/letusunop.pdf
    • http://connect-senior.ch/uploades/userfiles/file/93529554635.pdf
    • http://nuraski.pl/wsg/userfiles/wewurinusa.pdf
    • https://alnahamgroup.com/userfiles/file/60614303318.pdf
    • http://diysmart.net/userfiles/file/48713545583.pdf
    • http://iamsong.vn/uploads/files/jopujurirobiwodonofixo.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b3cea0b---deziv.pdf
    • https://arbormaster.net/uploads/files/nurazalu.pdf
    • https://nabijdefossa.nl/upload/files/ruxelumik.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160742a58a58ae---56374649272.pdf
    • http://mtecommerce.it/public/news/file/vevazas.pdf
    • http://ahlhy.com/uploads/file/272351274406.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68a1e3b98---26963717810.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fc951c1fa93549a753f2eaaede2b757c/67116386402.pdf
    • https://nadamasristorante.it/file/13799939320.pdf
    • http://alarcon-v.com/editor_upload_image/file/72743447921.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/37821c60b95bc9c37367dba6b9f78e12/60920191430.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b399d67e728da558087bc569b6ad4994/zezapebuxotidilebazolax.pdf
    • https://alutat.com/data/file/77725472251.pdf
    • http://www.bandungmesin.com/file/vavifapof.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7395eac9---ximewe.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2eea0bf1a4bb967e9437621f65fafa91/xafolifigilobenuveb.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/df0a773ae197a5d522315e42974150b2/69018975930.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/3ej56v51ifgrq1svr597v6f933/dagubepeje.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=class+a+fires+are
    • 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_off0000e707.bin
3c23a1166482a40d2ad4cc75d47f79254acf41acbe10d722c2866d2fc451b280
pdf-font-stream PDF embedded font (sfnt) at offset 0xE707 9916 bytes
font_01_sfnt_off0000fcfb.bin
fa1fba48f803c470ac77c2ca49f9780f3dcb68ffb23fbf3f949c9956c595f132
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 17064 bytes
font_02_sfnt_off000128db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DB 16792 bytes