Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a46a1d20654e25…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 18:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7730ac95ed7b5f14103375884fb0be7 SHA-1: b3adf18ebabd278488638dbd3ac0a471437669aa SHA-256: 89a46a1d20654e25b92021123a6619f0c9bc2a4dc222d9aba28cfbd3a50538df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader, likely to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sino-web.net/filespath/files/20210909151806.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc805a8518---bijadowetexil.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/71da9a08ba481fc02f6493902ac1b78e/78791644161.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/pododopowedejakenaxasage.pdf
    • http://netinflux.net/userfiles/file/limogoxigajamuzil.pdf
    • http://asacnfservices.com/ckfinder/userfiles/files/71896524093.pdf
    • http://www.golfusa.be/userfiles/files/nisoxevupupogi.pdf
    • http://scpt.it/userfiles/files/86506693982.pdf
    • https://www.zochrot.org/ckfinder/userfiles/files/bapelubegofakufasilup.pdf
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/jiridipamowelupo.pdf
    • http://immobilier-valence-agen.com/userfiles/file/bugunusefe.pdf
    • http://e-sheremet.com/img/tibobirajijolojuko.pdf
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdf
    • http://milwaukee.center/userfiles/file/giragajajanez.pdf
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdf
    • http://riverside-plaza.com/upload/userfile/files/pojom.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613037f103ae1---rasinenonutirunigazimi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe02abfad---6962975909.pdf
    • http://managhantasala.net/mailuserfiles/file/bonufadixagavoletigese.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/52203823340.pdf
    • https://gadesign52.com/uploads/files/202109050627385632.pdf
    • http://garderoba.sk/images/_file/xibutuworomofivufumide.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=freddy+fazbear+pizzeria+simulator+download
    • 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_off0000d38d.bin
d967405190278413a2cb2f041709628a01b1ca73281233a4a02fe686dd930a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 17232 bytes
font_01_sfnt_off00010044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 16792 bytes
font_02_sfnt_off0001185b.bin
1bf728f17885185feced95131002fdb550db410a6d4ea19b4565f61f942abf76
pdf-font-stream PDF embedded font (sfnt) at offset 0x1185B 11136 bytes