Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01ca44f83423baf…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 12:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f41cc8e018ca707c60a4f0c94ad68c02 SHA-1: 4c4ec47031dd051b60385bf406a56c949950c8b4 SHA-256: a01ca44f83423baffcaa814a2ee055df423e3eb37b0ab48013f8552336a8a773
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the presence of a link farm, with many URIs pointing to compromised CMS uploads or disposable hosting. The document body is unreadable, but the heuristics strongly suggest a phishing or spam campaign designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crewmak.ru/uplcv?utm_term=fabby+apk+download PDF link annotation
    • http://jngf.cn/files/file/1789459434.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/65331963522.pdfIn PDF document text
    • http://artepcb.com/upload/files/notezulesikoki.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16948069301.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5935451499.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/zaboxe.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3c29d9f8---673929944.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lumilopilad.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/56110592799.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/14576888110.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/muxijorovaderitidizivo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc10943610---9121490634.pdfPDF link annotation
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/11678726801.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/bavivenufonoda.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/95357135132.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zexiruwixosoluj.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/lejunanewevuti.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/kezisiwobojimuvisilafefes.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/74714340825.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/davexugawavimi.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/85981346523.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/59011543553.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/44577515266.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112e7b7dd5---fawex.pdfIn PDF document text
    • https://emprenderem.cl/files/22942916594.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nhrc8m6kbg38ffeih8bd41t1cd/32219162822.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/1550798757.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 10204 bytes
SHA-256: 1f97070c400cf74fdbc511c8ab85f705dd416b32ef16b25596f81198603b7a29
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 18572 bytes
SHA-256: 76ad8d23d249cf77c89033a3daa42fbf794a56c8324bfe13f080d673598e3d73
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1