Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92604fc0b73a025…

MALICIOUS

PDF

114.8 KB Created: 2021-08-12 21:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d8b056cc12d61fdbbc3555da7eab0f22 SHA-1: 7e8c4796fa928dd6a3533eba49faf12db24f7dce SHA-256: d92604fc0b73a025c16db072361b845bbc7aa531335e285f5569c27fd30a8fb3
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

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://pixomot.ru/uplcv?utm_term=120+lessons+supreme+wisdom+lessons+for+the+nation+of+gods+and+earths PDF link annotation
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109009347fb1---6274051146.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/1l42gsa7o35ouh7vn8tuo01ap4/27660419185.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061522004673499.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/87315731501.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/73713289364.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/77d101138d528506f16d55a3242c953b/redemedipakebawobujoga.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/0b2af0e1968cdece81ee72bb8ac7b275/tosinedowebunatajorelim.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cedc0deca69d38e0cb2fd51b7ca156bf/54600468403.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ee213029f918a3eebaf6a72c819bb669/27695541172.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d8bf3a358---23573647936.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ee54ea68---47227802421.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/199e11d5c2245e0e2a852f0103702436/dowijuvexuwiwujamulime.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b92903b7c3---benililasikemikamuze.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c480a5ffe---17561772759.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/49997327599.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b0be530fd7559db0ef80bcb11b017212/57737636391.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/28353097836.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/rejidasiravibixiv.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/turiwilu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/vowosixa.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695d42a1f7---83688930928.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/49673669987.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d7050294ed4---zoludotemifeketi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1941e590b8---90036403565.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/pakisatikotujoto.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/lapumopevuxisagubela.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_off0001415a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415A 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_01_sfnt_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 19252 bytes
SHA-256: 17a3bc7fa75464532120a6e16d4e322c111ab1187d19fadf1e902f27fdd65d2a
font_02_sfnt_off0001892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1892F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A146 11328 bytes
SHA-256: 707475b1d3dbf72d1b5835073ac390a9e7a62f6719548f480d6ff967675f8086

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