Malicious PDF — malware analysis report

Static analysis result for SHA-256 633add936bbf5da9…

MALICIOUS

PDF

81.7 KB Created: 2021-08-15 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3ea397b94bad91ce5c6a7bd7fb007ea SHA-1: ac7d3d1e6685fb022198517c0a69e1b93929a310 SHA-256: 633add936bbf5da98a8cd0399d3d1a518205e2431ad000558848f35b6d889ee5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://abington1964.com/clients/865474/File/guminurojurok.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4skhs0uc8c8e3afpmjgf1sj4q4/wegoluvanaxobomubona.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/38639128722.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cbdf46b202494a9b36fef0f073044e4e/tubanimab.pdf
    • http://ehomeforeclosure.org/images/file/8476940329.pdf
    • https://keongracun.org/contents//files/faximoxal.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c0e1124df33ad7dd8d83653abc74e1e/pubomuriwebad.pdf
    • http://handgun.ee/media/file/21361537130.pdf
    • https://inijariku.com/ckfinder/userfiles/files/pemelaxiwelasavojibe.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/kamegiluwapoturowug.pdf
    • http://honghuibio.com/d/files/31672515563.pdf
    • https://infotechb2blite.com/bot/ckfinder/uf/files/23851189901.pdf
    • https://contabil-fiscal.ro/mm/file/70765956664.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/makefuxupaxazidinoruvam.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d26936d91f991a3ef7bd0207d3b46840/16361710140.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1a0e6820b2e78841dfe5926db265f03f/tilerepiwatufa.pdf
    • http://beerskiboot.com/img/upload/file/75761400205.pdf
    • http://boatmonies.com/uploads/files/worakoxogebibozokenawuga.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2823f517---sobudijosapezutunisetu.pdf
    • http://pk.mo/userfiles/file/lesotamozavanomigujeb.pdf
    • https://invest.pl/userfiles/file/sukogufigutok.pdf
    • https://hasekei.jp/userfiles/file/xinidaxujigosoz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=1v1+lol+fun+unblocked+76
    • 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_off0000dc33.bin
ccba4e951e474a2d1cc670a465c4b3f171e8b8bbca0bfc8909483692bee7eb4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 10420 bytes
font_01_sfnt_off0000f405.bin
83242bdb50d8e2b0b30761d5b17db8046cdf927ab3bb64c98f6babd254497293
pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 17280 bytes
font_02_sfnt_off000120f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16792 bytes