Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc25325d1280dac4…

MALICIOUS

PDF

100.8 KB Created: 2021-06-28 14:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cc0b6b4ca5b6a40daa1d027c3bb8f88 SHA-1: d4d99d9769537877b6fa78e23b7cd86d934764c8 SHA-256: bc25325d1280dac4334716b079a20effca5b4665b927b4a9af490c85a60e23da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://srihemkuntsahibfgp.org/hemkunt/userfiles/file/74883340113.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/gl9dvbv0n1dkqvr6bbuftjgats/61693818598.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b60d43fd78ff780ef1cf0e47cfa104c4/nawafipepu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f33597bd1---tafurikanarag.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/343266f3867f998a7984415dd6d86092/mugarosalivibomorer.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/f7ct2h9c9kaj9m5nbrdqt6dl01/36958239464.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a83cc89bb1f2db1a9f888ab690517bde/51571832838.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990fae96e95---bujaxebufulemimafinugam.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0bc11816cd41ba824317741d6f6b346c/dasanizima.pdfIn PDF document text
    • http://simonide.org/userfiles/file/8160010772.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e138e6f1756cc2ac4ef745e99e00524c/mebuxewanuwajanepezedo.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/85974397046.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7a2c6002654256ed77c168eaeb96f8ec/xefukokadisuzew.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f286105a---73201633494.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f95ae54b6---verotepete.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/5417109503.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/30528726167.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fg51ag5g671c6lvvp8tf3lr44d/xokuwerolaxebafoxar.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d272204b---19453588634.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1c8908c6c406692579b84d3b2fd01cc4/lotimilo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a892c6805fed4fd1bfb4e0cd53cdc3d4/59539992079.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4affc01508fb7fb1a601a7211e574e1b/suravofezujoxiwiro.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/91820123075.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ljlbsrudtodj152etmm0qkpe25/nekadibaxomaw.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a42b2d6dd342e179a40eb8a83e4ea735/28481282645.pdfIn PDF document text
    • http://santeh.md/img/files/39726161186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=potato+osmosis+lab+resultsPDF 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_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 10408 bytes
SHA-256: 28a269195d19bf0e44eb2b669b0cfd0ba4f6612fa3510e29a7123aec680060c4
font_01_sfnt_off00013f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 17632 bytes
SHA-256: 4a3c4aeaf68e7e4b18e06391fd287216cbbe9f84a648bd390045d6a4708f4cf0
font_02_sfnt_off00016d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1