Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a7ca2833c3f57e…

MALICIOUS

PDF

76.6 KB Created: 2021-08-14 15:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0aed03deefcac0ec0dca30c3dce090c7 SHA-1: 34139b9241b0071c57c257f8189f86a5c8ecd2ec SHA-256: 68a7ca2833c3f57e49b9daf5e89ebb26b75963cd99c41db75f89cb7025daef4a
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nilsagame.com/calisma2/files/uploads/23601344707.pdf In PDF document text
    • http://burfel.ru/upfiles/files/75040046316.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/3800875936.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/94371019889.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/kanabogup.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/37004505769.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/kusagudegezatobesoxubiw.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/rixin.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e47abbad1---19931885187.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/97713742292.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084d86c9e708---mezorobaxibifesibexonu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/sq7tg75nu50qpcuag235dca5hg/28812461287.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/baralota.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/89413194742.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/98faeca3cd95f789b17d5b25c725d2d4/22512174163.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/38064616774.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc71d91c70c---6411085199.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/79485656551.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/99972262445.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/50530761216.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/16841839924.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/45119773399.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/86122573012.pdfIn PDF document text
    • https://plasy.com/uploads/file/50347001514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+all+microsoft+windows+operating+systemsPDF 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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 16344 bytes
SHA-256: a609f5bbe3453ca8723c3bd23f1708e9a0ffc4af47936bb6b9d4a124af5b072e
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 11120 bytes
SHA-256: 92700b88af1598d22554437a0af938fb5f4c3a3adc555bec16bbc9917f26bde5

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