Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cafa4dab07b0b4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: adb82867b67ee1b5480ea9d48c3e2c66 SHA-1: 93810dc98a8d43fe27b325b04e80ad99b2e97c33 SHA-256: d0cafa4dab07b0b42570a033ed308517a672d0a6a68cfb03371ec3c95bda6b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended for phishing or malware distribution, aligning with the characteristics of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=aqua+park+io+free+online PDF link annotation
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bodopojazumiwikibanefebi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd863da5b0f99afa9fe54dfd1ac3934a/jilifemo.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/xewafafopasuregopelizutam.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/12419327157.pdfIn PDF document text
    • https://rafautama.com/uploads/file/40498756258.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/mujufuwewekejawekajunoxaj.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab6b19189---93540715452.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kuxebumuverejepobibet.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/nizexisagofa.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/74066623368.pdfIn PDF document text
    • https://irrisyst.eu/files/file/bejusapikul.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/mesefitifofunot.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/mefujatibomipusafibepube.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lm9l6kh47h0cl7s7hrfhd97im0/94055780697.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rizatukirasunexugol.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/23424116003.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/89200915178.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/zajemuto.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/59009498103.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/zoborobofev.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_09317E1C3EFDB6A8.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wexedekevadisigifijokemus.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e15be4d84---59673527516.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/73386472309.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_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10404 bytes
SHA-256: a294606dd5d44347f6a832d087a9606c4071ea451f4a17fefc783a4cb0b08a9b
font_01_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16992 bytes
SHA-256: 7dddf18d4521c6b8d4dbaae8ce397aa58909f057782a4731f12c9eee43d5d5d4
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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