Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e7fd4af8cf2cde…

MALICIOUS

PDF

96.0 KB Created: 2021-07-26 08:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18ea1f9513cf48b02b0fc62624088004 SHA-1: beddc9c28febc1bca04db49d9c0dac89554f7470 SHA-256: 35e7fd4af8cf2cde79dab186584cd12b5a8b2f582a87a7a1459ce6994d324aae
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8756b019bd4355a7252939971845c336/nogefiwisofu.pdf
    • http://wenxuezj.com/images/File/64966344039.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd71f2e3d3---97232294613.pdf
    • http://dorrstrechy.cz/UserFiles/File/kusidakejafopike.pdf
    • https://cortopolis.ar/userfiles/file/60981583677.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gub08g2dr10fl72qa0unvplrqm/segiwukekobugezaruz.pdf
    • http://iburgisidimarsala.eu/userfiles/files/jugaguwukepuduweti.pdf
    • https://drticket.ir/basefile/drtiketcom/files/70153874185.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/8bf9a81ecf6f590b42eb48ab93b49f87/5212113579.pdf
    • https://vivekanandbawwa.com/userfiles/file/dogowadufo.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/32540623729.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e312abdf03a---49474506181.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e69eebe05---63891979829.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/31736136601.pdf
    • http://hagelkonzept.de/userfiles/file/doxizogulelezikemidij.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956a7d33f1---90898260571.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c20c8aff---namujago.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1ca9c695743429f048b108f7f7dc547a/31034932892.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb71a000---73401937740.pdf
    • https://discovercefalu.it/_data/images/file/webarefawafatez.pdf
    • http://ufnk.fr/app/webroot/files/file/81917892756.pdf
    • http://al-bandak.com/userfiles/file/30121444222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=paginas+para+bajar+peliculas+gratis+con+utorrent
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ca.bin
28308b1f9e83dd19e74efc80dce26efb48739a20dbbf91269cec8c6128e5e56d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10920 bytes
font_01_sfnt_off000111ef.bin
56d8a879db1ecee766c1562157ac039afe18f3cd548c7604cb428491f01b2a1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 18836 bytes
font_02_sfnt_off00014225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14225 16792 bytes
font_03_sfnt_off00015a36.bin
dd83067eb133e7faa5eaf37ab1fe78ce06fcf953ed0f23962bc054b64bea50ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A36 16316 bytes