Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c83860ef1bead93…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 09:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18c23361873b4e6f67e3da1db8db4bad SHA-1: 292e2fc25b503928fafd72f68893bbf966567b0f SHA-256: 2c83860ef1bead932a029e2161b802f40877a5246ff998be69c5e98076e244f0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown PDF files hosted on compromised or disposable domains, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead users to a phishing site. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://produktybhp.pl/pliki_user/File/vodanivopazutetolavud.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wusidajijoloxa.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-20-08-35-11-44.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607534d930c27---1447021391.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/25221751412.pdfIn PDF document text
    • http://industra.sk/userfiles/file/37670183124.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/39368067045.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/99062827717.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760fa7e34---66729297295.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6c12f299b4f110670b2363ba595d59cb/falajex.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ej57rb34abvdmon2b1marqubp2/61013277221.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4980136984---gozusikavusalogidabiwov.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c3557843c6bf8a8eb79de4e793c4dd1/58929952594.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edefb1b8b43---lazevaxowepiga.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be79cfd4d00---zuxekagoba.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608834052fa15---saneluxiwokoz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084501d18433---19762556609.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7c5912947---fovinigo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919dcb76ddc---maredobekibelovadiw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/96503747167.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/37031184186.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/12196716465.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/18021380405.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///88322810244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=3rd+grade+math+test+practice+worksheetsPDF 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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 11064 bytes
SHA-256: 27f7a397ce00f71231c690472e3b9740b93f3ee114225fb825a4171bb301067c
font_01_sfnt_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 18384 bytes
SHA-256: a492d8cd8b2d26e547f37efefd0a3f26f48f3ad4bdb511ad5d62582291de54c7

Open this report in the interactive analyzer, or submit your own file for analysis.