Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a7adaa6913a6bc…

MALICIOUS

PDF

85.4 KB Created: 2021-08-21 02:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3520e7f7086c550e3fd8ce52c2d79901 SHA-1: 6a4cdd796d2a9d87513f677a1a859e0b6451bcd7 SHA-256: d8a7adaa6913a6bc499cb46d6c5ec59a790dd44e5389eab20d0a633811bc38b8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics indicates a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://hotelmitrutarija.com/uploaded/files/78241479333.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435b6e73d2---pukakavo.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/gafarexaxigetudubagolagut.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/sizogefipusabuzokalufu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/83625790383.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de01dae7d5---86604605533.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/vivesev.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zuzoveruvexip.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/56648347833.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/18330066550.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/lafapo.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/wuxifepexavabono.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ltocrr38o4kkoi21qol2qe404l/xotopamogevizogaf.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/23307661964.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/dolinuzaletebelederuvuj.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9b4837adb93555fe1841d34312e614f7/kowubesunubixidopujik.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/34435542451.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/50710490392.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f96cd0ec803ef27220b33ca4391a646d/39010088280.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/34582908110.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ff5c28d7---52965774369.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gi82k0ji2ganto5cu3356o0qj0/mipanevusukunab.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/gikibebe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655dfe7---5511217300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=avengers+endgame+full+movie+free+online+redditPDF 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_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 10844 bytes
SHA-256: 2c202f0b986e76d485b577621df66f5add33c6c0761e29fd07ac0dbec175a9c0
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 17140 bytes
SHA-256: 3fc31939d0c65305a67f049f51594b7faea5a258dc51ee0190b4e3aacc6887a4

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