Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a43116236e6a71…

MALICIOUS

PDF

93.7 KB Created: 2021-09-05 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8ee9c6c6e1548a1160b3aba308e28d3 SHA-1: 1f601f9c968418a311390a15af1d5f38a3fbf2a9 SHA-256: 79a43116236e6a71a2ea6d1cddc4f132015551a53c500163d02987b11f69d992
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It functions as a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an attempt to trick users into downloading further malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be0ce47e2---rumumuxiwibasumil.pdf In PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/81f86b2448671602703aa8b4eae7a61f/73405829399.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/57894556482.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e614beefdf12333300a9d6e3373012cc/47679895175.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/92285998256.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/24943778033.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/46603115137.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0704e84c---xikiperedabazefaririx.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/mopinusev.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/16610996427.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/zabilagefetig.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec192ecfa7---57221361567.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3c9520be6---neramupo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pfbalu510ggtm5m2qpj90onojs/20258794975.pdfIn PDF document text
    • http://ledins.lv/cms/file/rixipabotuxefizar.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ac765bbd---duniduxinivu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/963u2q1000080g6mm2kd8kk6fk/97230071154.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/sirojevewekikerime.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609223928671f---51171814467.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1b7b86d0896dfc895d7b235ccd72efd0/lelureduj.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210806021214_zmfzh4.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f7689591b---31260680788.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jopnfrgn63misv0ms8nbun489f/67714212352.pdfIn PDF document text
    • http://safetypath.net/cms_images/naxevisavulewixega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=zircon+studsensor+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 22128 bytes
SHA-256: 05d6ebecb660ae59445488e79f7f3acb00fa87524f9678af720f43afd8f8876a
font_01_sfnt_off000138dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F4 10596 bytes
SHA-256: d5bb20e808cfbe3a6be71e4c38e2e98ba85f00e09f303c0634897e20ca4c581f