Malicious PDF — malware analysis report

Static analysis result for SHA-256 46835a31c953a9fe…

MALICIOUS

PDF

108.9 KB Created: 2021-07-02 22:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e23b7ed6a7028208685543ad432518b SHA-1: bf439bc84064e9f32268fe9899f77a3746933b36 SHA-256: 46835a31c953a9fe1b6e059d56c99101d32fd20c7055d4cac95e1e67ac4b8a6e
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ae35cd0eaecd1d35c2183813727ffc64/xafukidas.pdf
    • https://tese.in/ckfinder/userfiles/files/15591114242.pdf
    • http://hyperasp.net/userfiles/file/femiwidedupoxov.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808da63cc1---xisikulujugubekesumaragas.pdf
    • http://jnnycc.org/userfiles/file/xixuguzapedukolelajowa.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786473800f5---38172016846.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c163e85c527---walus.pdf
    • http://newabel.com/ckfinder/userfiles/files/rilixona.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df3306ab---91067654691.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/49ja3jd9ni3l6baehru3j92i42/dagoxizuzusikanu.pdf
    • http://aftckwt.com/uploads/file/23119277227.pdf
    • http://uhli-janmaria.cz/userfiles/file/jowanerirewugafewe.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9r0genqtpme15cq7h4q7oc7mo1/durojopojepakulim.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5690b58898---63658156988.pdf
    • https://anakmeong.com/contents//files/5793081357.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vugic490p5q5jrvuo87afp6tvh/19321613411.pdf
    • http://pressvaluation.net/userfiles/file/zuwenipidazutoriga.pdf
    • https://betalinktech.com/blmedia/file/fosidalesufeferiluza.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/gibitopo.pdf
    • http://cattaneoarchitetti.it/userfiles/files/noninanizojuwozugafus.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd3bbac18---xomijarojurosibuki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=diderot%27s+encyclopedia+was
    • 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_off00014596.bin
ce1221a5819d7756553d1b6f1dcc379320f17d2f432e54aa23d1393b2f1a63fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14596 18296 bytes
font_01_sfnt_off00017424.bin
737963d8c2e45eb49233470b3b028c31ac2de8332e5e99e7b9849b62d44aa2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x17424 10744 bytes
font_02_sfnt_off00018d13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D13 16792 bytes