Malicious PDF — malware analysis report

Static analysis result for SHA-256 73603fce48be9782…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 01:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2164d6256b4297b0b2733af5caa7ca20 SHA-1: 647cea9f83f962ae4f3d314461aacb90cad019d6 SHA-256: 73603fce48be97822cb0bdf498449879be44448700e1af59a1fd43330c25795c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further indicate malicious intent. The presence of embedded URLs and the nature of the links point towards an attack pattern focused on luring users to download malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=truecaller+gold+apk+free+download PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d232bff46---zovep.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/mirikokor.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/nediliwadawexurona.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/96773449680.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/42079982713.pdfIn PDF document text
    • http://donghotam.com/luutru/files/2636084115.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/67066072048.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/33129529375.pdfIn PDF document text
    • http://donghotam.com/luutru/files/nowugiliwufopup.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cotttg4pv0kp9or07qhq0450fi/beboriruwipozuj.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/dijumefadito.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210921055011885.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/86077491985.pdfIn PDF document text
    • http://lamay.de/userfiles/file/gikadixune.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210920084634_231735971.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/xifikasisejijex.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f40105ae4b---tulibagoxipokim.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/xesexajudojipupeg.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fobekejiwe.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/kalasofelu.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/neguxed.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/33428241002.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/v7374773471r235jelcl99pfki/piroduvire.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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10676 bytes
SHA-256: 0f16c601eaf250e0d22adaf231cf01927c55d3c99972bcaabe71bb34972f027c
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16976 bytes
SHA-256: 93839eb6536d6b817b7d926a895f7a4a222bc6da01e33bec5f6c60ca3c4f58a9
font_02_sfnt_off0001220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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