Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1428f48ca3dff5…

MALICIOUS

PDF

79.2 KB Created: 2021-08-31 12:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3e57b1098f0b089ea1191b8dcc13eaaf SHA-1: 1609501d6440df60edbbee38019d1dc04094da81 SHA-256: cc1428f48ca3dff5d98d7b7bfab9d8fbb69166cb242c628b992cc76dd1584a19
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 multiple compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links supports the attack pattern of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b4a515a644f9c8ffde0f7a683bfca259/gexada.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a10fc91e7---1518655857.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0040f9a0f9bec836c2d6e3c1121800de/73332441020.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/bazuwodifemeradelo.pdfIn PDF document text
    • http://strandedtattoo.com/file/2866472153.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021083015310673499.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/61806840213.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/38295207207.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/97891035886.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160717fdf6355b---nusala.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b6889fe7a---18198175879.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/neneraz.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/bisakerizolaroravuna.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf518c8d7b---genalizewi.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/vimuna.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/6200320166.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/sewitob.pdfIn PDF document text
    • http://chongros.com/userData/board/file/4038593608.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c056d9e6a---babajil.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/98727d3ed2c8af392a59408ed594620c/24681774635.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210721104136_nmwyi0.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nutugobokorojagipoduxoto.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/pidivisejudekafolevuta.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/zinunegagidonudezij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=married+to+a+schizophrenicPDF 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_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 17728 bytes
SHA-256: 59d7f905296405d5c317cc3ea1f36641370fb69ff0de81d8cca2bd37849eccfe
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10620 bytes
SHA-256: abdb2d292c51b86ead668e241735b9f4f9797eb67092a1577897abba2c473517
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1