Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c6b6ed701b5815…

MALICIOUS

PDF

127.0 KB Created: 2021-07-30 12:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d242086a30c8834f0f1f88170b0f1120 SHA-1: ca85904b7720d1d308e053faeffd522eefdea4a8 SHA-256: 98c6b6ed701b581542e6442106ac3dc099dc3e2fbd0e1587e903c0201b7a932e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malicious redirection campaign, as indicated by numerous heuristic firings related to external URLs and compromised CMS uploads. The presence of multiple links to potentially compromised WordPress sites suggests an attempt to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are strongly indicative of a malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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 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.
  • 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://cructi.ru/uplcv?utm_term=my+hero+academia+season+4+english+dub+funimation PDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160768810c7860---64484398027.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/2681265810.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e3c34fbc40f6e3b970d8e8185ac46c20/93175515342.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021053003583873.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/74811603227.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/69716819918.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c89d04c31b5870ca97e897ec533f1c63/guvukur.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/nezaretubexexapofivanid.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7382e5f5---busadupajova.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9m9ilfql3ecbj0o1ik3hs176l5/tedadalunoda.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/wibikovazajotujonunu.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/sivivifovufolukuzukewafep.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/kadofilixogit.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/muruzixedi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd6582a3fe---48767715113.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/85086503799.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sutapekelajebolo.pdfIn PDF document text
    • https://people11people.gr/uploads/File/ridamifoxakipedidesutudu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/xapapokone.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/34999533833.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/54545791948.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24357d467d---94527562635.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/297d31cda29b3c032f8ac49963ef23fa/kusomamaloxopojuvafi.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 18532 bytes
SHA-256: 0442a4078fdadd235996c4cc9b6afa03b90eb4666534f4561b8a55e8f0b3d175
font_01_sfnt_off000163ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BFC 20188 bytes
SHA-256: af0983bb8fb8bc82a40c64d57b72d5e317728dbfbf1732c8e7db131c8c279595
font_03_sfnt_off0001b903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B903 16648 bytes
SHA-256: 5feeab2ca20be7c11e583cea60e31db209aeab629c20b70998aaa8e45fd7b42b
font_04_sfnt_off0001cfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFC5 11348 bytes
SHA-256: 57a11e76464afcabdbdd4c488df59709a8967053691e149a21216e1b954ed4e6

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