Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffe640bcbf175b4…

MALICIOUS

PDF

103.9 KB Created: 2021-07-08 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d83d45b59b3a1948ada311c0c5408af SHA-1: 5027c6a3d8234dd7ff73ca75deff90a60dfb62cd SHA-256: 1ffe640bcbf175b408099929ed9e53812de9ce6012776d8daa0442bcc52e8276
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 sites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a05dbc7f994---sexapapowew.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/xulebisagituzu.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4a18e09f1e3954c62ebf36795711f899/69227777067.pdf
    • https://shopinhome.com/ci/userfiles/files/41497817604.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086191d688ae---78753726639.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7e0a061494914d69552e0f9f2b5f9304/22892735014.pdf
    • https://askisan.com/upload/ckfinder/files/falepixaluvojetep.pdf
    • https://akproauto.com/nbloom/fckuploads/file/35225114190.pdf
    • http://apluskleaning.com/admin/images/file/19877947990.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fa860ba58e996b6871563b25d2ae8137/5475980952.pdf
    • http://anupbolivia.com/images/files/davarifonebolakus.pdf
    • http://jrmhandling.nl/upload/file/6633099269.pdf
    • http://dentish.ru/ckfinder/userfiles/files/jijitifodudaxepul.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a821fc48100---nixosabodirenawon.pdf
    • http://cycling-software.com/files/file/xofesutoxi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba4067a17---91664114591.pdf
    • http://domainecomps.com/documents/files/83806119636.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/556d6db328d9aeebb08b47549d65f881/gogiwovirotifufo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160778f747d1f3---joboberuxegebuperokunowo.pdf
    • http://fotossc.pl/_files/file/masewovekodewebalugevox.pdf
    • http://abpaluso.com/upload/file/bekositolevegir.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sv8kl15qu7419rshis5et9rpan/sotujuzo.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609897bd1e2a3---68613478980.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+does+critical+literacy+mean
    • 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_off00011f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
font_01_sfnt_off00013798.bin
530d8112c007e7de7cee9c1c8cbb5ac0781ec6873198951bdf692b70dd7a2806
pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 10740 bytes
font_02_sfnt_off0001501d.bin
c24790de5652cd0a1a19aa8e1b5da84dbbfb9665d1bd6853b964809343d57bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 17400 bytes
font_03_sfnt_off00017cc7.bin
21ff46de98f0902b53a5c0c946916a1dd4551bbaa4204463728281c4bc54dda8
pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC7 16088 bytes