Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac00722e695073e2…

MALICIOUS

PDF

137.4 KB Created: 2021-09-06 13:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 970afc10ac850f602fc8a09284df21c9 SHA-1: ad2fddd9f663efd17cad1e1a975dd34beddb9d88 SHA-256: ac00722e695073e206b7618aea4960ab388e657f73ea8aeb3809e9e9b60b1659
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ansing.nl/userfiles/file/71826192947.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f5f6b3a8---joporusuwidodexen.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/12e7d721974bfcf1e2ccee46f96ea713/venepi.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/eb16c5f43884a8ae5b69a92b028d7c7f/93363247486.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/10113082601.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kotekalepulisawesukoz.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jijitifodudaxepul.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72469505772.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/15886298537.pdfIn PDF document text
    • http://simonide.org/userfiles/file/29601616008.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/koxosexexixusixik.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/29a87775383135fa1e4e4facdd9749b2/89911789375.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9177c684c---20633550530.pdfIn PDF document text
    • http://aquatherm-graz.at/files/84151857633.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e81da58e---vobadugupap.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uiuiaeuakml8h5mk044e4837i1/78956884807.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qan2juj19i1ta46efp4crhuher/vidip.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098613de9eaa---6743397152.pdfIn PDF document text
    • https://simorgh.it/uploads/file/vesawekekuxekubujujim.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f069454454---97614440253.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/36979682526.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ba31822361b933a15d4e44e5746ea23c/disologekazawoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hebrew+pictograph+bible+pdfPDF 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_off0001b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52E 10844 bytes
SHA-256: ac5f9d802240d01eaf2f207d9439426646624c6314950b6d57c73ee591112c6e
font_01_sfnt_off0001cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDEB 19048 bytes
SHA-256: 2aedbaeddbd954741c8bd5b04b90701320fcda4a423fa02f6946834346f3d8a7
font_02_sfnt_off0001ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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