Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2addf50c82e05a…

MALICIOUS

PDF

91.6 KB Created: 2021-07-01 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: afe801a67bd49b538a1bafb7f67aa5cf SHA-1: b64252df4aab6040df2e8cd345a32da4e2417e79 SHA-256: 8b2addf50c82e05af9b6934b587b0256f23f0cff929197008b2639b9da1e9bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://medvor.ru/uplcv?utm_term=meaning+of+outstanding+in+marathi PDF link annotation
    • http://mixmarketing.vn/upload/fck/file/kuriginalazoxipuwu.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/17bcbfeb7cc13160a66ba060fc8204dc/rominodi.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/54947606688.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/27722181292.pdfIn PDF document text
    • https://melz-feu.ru/upload/nisijudifiwukudapepigulu.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/bupamulorojejutisal.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/96de6a2dca4e05e119d03144832fa773/59365744819.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbebfa78a0---wigasararedepul.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fed6e3842---dedozutox.pdfIn PDF document text
    • https://senhewood.com/d/files/nazubemiwugebuxoxirevad.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/17419104330.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0186bb2e---55367322684.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c57c3f17d42ca26987f0fb872c91287e/xutekufetorejenegelu.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/30731391775.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2ft4g8t5cn5oioj79mcc04lp30/75638387120.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/1488206505.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/61933619907.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/76846244331.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lajiramu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hg1ugbt7jo0mtvp6da3d0g421g/rumumuwofanisu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d04387d322e42a277d770a3961901a52/1925178993.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/037ee5db4df04d068495ecca2ab4c080/mibalexasewugisuzozerif.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 19396 bytes
SHA-256: 58f1d7c0a7cb97658a7a46bbb4f82b4c8e3ba7c9003a4dc923a8cfc1e1e5e72d
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 10848 bytes
SHA-256: 4291f23ada8effb1de2abafe7829dab41fe5068a93a5a2ad9985d3acb73fae3a
font_03_sfnt_off00014b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B87 16064 bytes
SHA-256: 313b4d1b1f982e25284d2f4e6caf7c0c7767db1f375da95b613bc7d89e59efd8

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