Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e75a55a3ac6014…

MALICIOUS

PDF

89.6 KB Created: 2021-07-02 06:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e2d48a16ecb4296820b88859bb9597e SHA-1: 1fc0cf4e0fb7ad56ae1eae327160df6cb879d2e2 SHA-256: 71e75a55a3ac601458e961b86d2fe4dde490a443e14beb0235c229efdbf43df2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096094b779be---duwimem.pdf
    • http://rentaruedas.com/files/others/16629243677.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160988c3c82e02---noxinilipi.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/548ffdc8de6656d5e99d7bd6ff632d7e/79988912514.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/33200473660.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/xodubef.pdf
    • https://iword.de/userfiles/file/laboduwusivakutafuvipi.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e9b4d7e799ffdaebcbd0543bc4df1369/lozobitariravewevogujise.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a454c00f538ba1108607b057f6454607/13717255736.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809aa456ef7---xufebamexufexefoja.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bf89a1372222940494d975d7eb406146/nalijemogozuluguv.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/512485edb404c0966d7f9cf9ba587c94/zaloxedulonomowenenuzov.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd16cb85---92132022850.pdf
    • http://wahiclassof69.com/clients/874294/File/bebuxeriwapibixufowevivo.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1jpc1f61ltlseofdin2cpm2854/xoribiv.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/o8vlc6ferca708os6caqdb7kur/35001115184.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22a3a7f70---dumaxefosemetibenokabete.pdf
    • https://sindonis.com/userfiles/file/puxuvazimejotedilisexub.pdf
    • https://invest.pl/userfiles/file/ganapuxoronofiluvewafoni.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0fe36776dab7fe2678f6ae13fc9ba6dd/59898508786.pdf
    • http://hrudolf.com/userfiles/81714336558.pdf
    • https://zzhqhi.com/d/files/sunimawuwodabo.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e395f85824---60178301590.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/zamafimaxodenufo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=galena+trolly+tours
    • 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_off0000fcac.bin
0eded4dc36a07a17aaa78769757e77d1f29b9f6c9035642c24c4ba850aae14fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 17192 bytes
font_01_sfnt_off000129bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
font_02_sfnt_off000141d2.bin
346468f2b4774a1dc6e495ab7ac167d58bc7fd528d07dda8630baea0d7916f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x141D2 10260 bytes