Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ccb544ee039534…

MALICIOUS

PDF

94.4 KB Created: 2021-09-09 17:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f39bf7ff9ee1916883c109fd73a51f8 SHA-1: 1356471dc750f6f2cf1f582a6c199f26a40908d0 SHA-256: 10ccb544ee0395343d8fd824a82a158f66c4a900a5be31f62a7a1cbdec3fc47c
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure to download a malicious payload, likely exploiting a PDF vulnerability or directing the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d210e9ff2---kevibefesewaziwawazewawu.pdf In PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/3285805300.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/34959454493.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161333e48c5078---53108101777.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613418c7b46e2---kojasuzapo.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56488385097.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/80248099754.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/7726030741.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/ditaki.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/80778336544.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fapizixe.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/rebogaluxovopuzegonunim.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/boxazanoketizonowax.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/76770272037.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/62943197829.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7378df16---86350734417.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2eb88a68---suxuzipifititefoduto.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/fubowiwuzarivig.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/lekazisaluresanemugitiz.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/zegalisuwuduzusorowojija.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/bepufopagilakefumakimosaz.pdfIn PDF document text
    • http://robedecreateur.com/img/files/3660533772.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/mutafodu.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/55003982355.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wakuradulisiwuwimo.pdfIn PDF document text
    • http://ktcz.eu/files/files/lifogelinifodavowow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=offline+mobile+strategy+gamesPDF 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_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12411 18212 bytes
SHA-256: e8f31d5578eaa8e6d5aa17c6b3d1018aadea6daf6572852d59331ecbbdbb91fd
font_02_sfnt_off000152d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D1 10836 bytes
SHA-256: b49a90f0707d9016066776e0b3702e72bf479879a93fa4fc100827646df773e3