Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d10e3b4274b70d…

MALICIOUS

PDF

79.1 KB Created: 2021-06-27 09:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6a007f01fcfac9fc9600a6322613d6b SHA-1: 55fedb754bc618ea0650b0dfbb0ba1e2033ad421 SHA-256: a6d10e3b4274b70d4260123f9bdffd2230516785ddddccc55a151efa0461893e
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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 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 http://travelci.ru/ckfinder/userfiles/files/benizatewobitibevok.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/146929e1accaf86770f2d7525361666a/gugibojeses.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e5198c8d---87591581959.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/97f984d9216572a4cadd0d94004b8460/kubojowawopibafubav.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a3ce1786---mizalawewubuka.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc7725f46c---danowokiwemebetuketi.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/dd24f1bc04449ed073576379ddd0027a/rosemefegafupadul.pdfIn PDF document text
    • http://vce34.ru/attachments/file/61820933704.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b54574ac5ddf5c7514b693d53e9776be/88118447351.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/17044096047.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/dbef7d7b7245fbb76f49d58601f63fa7/vezobe.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/64662690151.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c973cba7ded---rajelabulisegetukaxos.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/zewukifavijexivupibixebun.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/467badng3gopihgtocne92d164/54916738301.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/dubopulare.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/63b1d1acc12932988282300b6bfd9748/36942473648.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/12278365317.pdfIn PDF document text
    • http://asustainable.com/global/file/6296937853.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/86dag4sriia7u4hajkqvgqr0a8/20034535069.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160804fc5dd309---7913810365.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/32506c0e54ba8b922140f9eea9a0a626/8236598313.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf9fa6217---30179673754.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/76a0e5b294f86e6237f1794c208ad887/gonekigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quantum+chemistry+mcquarrie+solutions+2nd+editionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 16596 bytes
SHA-256: 1157e81a791d41303dffed764140930c95fe781e0577f4d059e2daf98dc7d4c6
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 15740 bytes
SHA-256: 9156407fca8afddd7147b50d0be9014a5f6282c6a730b5591cc46e5d52c51b19
font_03_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 11176 bytes
SHA-256: d5f78488f76873f4863eebf6fca2ecfc76b5c2f592453137512e6d54cd51c7d8