Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e069aa371508f7…

MALICIOUS

PDF

87.7 KB Created: 2021-08-26 05:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 917f59681abcff51f6d4b48104379782 SHA-1: c42bb99251a068dcdfc48aac1e4651b2ab1873a9 SHA-256: 70e069aa371508f7bcf78c512b321fd565eb2732449ea924937b0d17ee5244da
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/333018e579e5848abeeef87cca90c838/99129844080.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16117a4db5c743---66053005245.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6371a59a---xivitimiwikeba.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/bitajugawo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/546b357331562e78ecc7b4a108745816/65608075668.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/wafibusogafonexukulup.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/31258692815.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/42479935007.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jovufogu.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/ruzasi.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/56604606264.pdfIn PDF document text
    • http://ubest.ru/images/file/22592481800.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/rirosawapuvevetu.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/kilofo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/24620212202.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/dewuwixiwawezegazowubaf.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/10657887470.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/wubofibelodiv.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae434dad6---joxekaxedodokifepupugoz.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7238f195abe55f703228c4ee09e3a82c/83619007529.pdfIn PDF document text
    • https://aneri12.eu/res/file/rotojawefinasurojob.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bapaxujesimevegakazage.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/2904275704.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123bd73c7529---loxariwotimilabawilekeku.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/84147601790.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/24015589187.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d4bd0156---kimukazomopax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bst+project+class+12+on+marketing+management+on+butterPDF 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_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 17432 bytes
SHA-256: 9a0438db909fb33c5d5cfd5cd0608bab547b6b03a7ae00db055a96a74e0096c6
font_01_sfnt_off00011d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 11404 bytes
SHA-256: d81f30c14edead3dd82cd0bc35a60f5f966ed7cab43bb8a73fb4e5ad5fc134ba
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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