Malicious PDF — malware analysis report

Static analysis result for SHA-256 168fd3be2379dd41…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 22:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f18d1ff23fe826de009f1bb167fa2d41 SHA-1: c1b9733d5bbd1bd82dc7335e308a0aab1c42ddd3 SHA-256: 168fd3be2379dd4114f92e5c2b49d7c26917ac51d6158607df9b38fc6dc71c47
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous PDF link farm heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://heathrowairporttaxi.website/userfiles/file/rasafabexememuvitisavusa.pdf In PDF document text
    • http://goldstecq.com/userfiles/file/40943691037.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904030649415120.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2199089887.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/3896937587.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/nelodifawisepelinujik.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/fogabugokuzi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/5f9a403e4dfafb67444c49892de9686b/sumaso.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/773433c38c0e022b43c00d42e0a570fd/volitavuwajizinoxifu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92349526209.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/remexu.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/mipowifojotifaralis.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gonavamilibeguvugasadadu.pdfIn PDF document text
    • https://gulamanis.com/contents/files/vijogexen.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210911_201757F3542E40B1.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b9d22dfd---44654339347.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/66568384469.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/64748350750.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/30760439740.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300bc8f4047---4400753462.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/ketemaripafesixodapev.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/mufarilupobo.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/vabarebaj.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/busegajisibiwuvararo.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/13044624109.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/16284989456.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a1bda13b36894fdc268383044e8174a/78660863761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dell+technologies+championship+2021PDF 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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17888 bytes
SHA-256: 49cd7487f6e892a85124a1aaa62da59a54223f7e76576637f3e3b4cd6bf69f59
font_01_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 11016 bytes
SHA-256: adb1c3fc5ebbbbe238d2bcaef4d703e0b222a5adba1df219766e62ffd48c991c
font_02_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1