Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d61ebf50f35ed0…

MALICIOUS

PDF

73.2 KB Created: 2021-06-27 23:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97ffd6ec168e8f33c91985d5177f2089 SHA-1: 1d00d7e806ac5e374cc49bc84f9f906a3f1aab8c SHA-256: e7d61ebf50f35ed09ff26b8abb56020df1fec85bdab0b0e8827ad9d900e9f936
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. These secondary PDFs are likely designed to lure users into phishing scams or to download additional malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0295e542---15793149373.pdf
    • http://gourmethousemacau.com/UploadFilesfile///24230792624.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a18b8cb0b9949f5d4fb7eae2407dfdca/pilepubedupedawivisim.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/03e34782a587d98744cfb84e3b9e5c6e/puwavusotoxijiradomam.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8c2657d6012bd37e3a91e085aaa9335d/81603563604.pdf
    • https://strechybenesov.cz/content/nebevokazulozaveratolawi.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837efa0df8---67371112636.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3f332c264e8f085bc542efa7602e062a/jugubiwesigidowakutel.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fe50bfd9---xetofaxonajexevokokib.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870b666f3c9---mevisas.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/hq5bb9lqm85s74gqm1alr2beip/88630643304.pdf
    • http://abacusnancy.com/userfiles/file/togaki.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80ebb93ee---bodepunanosas.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883862d6aca---woxunejej.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e77c9d47---87447735755.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082900b74002---xerobewon.pdf
    • http://alituncer.com/userfiles/file/79794725572.pdf
    • http://santeh.md/img/files/fabiso.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4d649f99---vesazuxupex.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b744847122---jetudojeje.pdf
    • https://sibconsulting.com/contents//files/86154714355.pdf
    • http://cuatro-pr.org/sites/default/files/file/laxarebezotosedas.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a346828f163---losisakaluxexoxiferi.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a2c211bcc5963b5540bf37cf695d46c3/31125370829.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=jacobian+of+three+variables
    • 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_off0000be87.bin
7dbdc20aee23e9a14c4a4d464004ee4fc00d4e62f1dbba143edcab900d6a9ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE87 10628 bytes
font_01_sfnt_off0000d6d2.bin
78b18abc69892a142d5b873048a8376cc6aaea07a378674ff5c36f1e0c841463
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 15708 bytes
font_02_sfnt_off0000ff59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes