Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8d663c66dd9be5…

MALICIOUS

PDF

93.0 KB Created: 2021-06-28 05:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 54b61d6b4f48c430eb6582eaa6cf4595 SHA-1: 41a69ba125b033f30e80cfaf52b272edf80df865 SHA-256: 0f8d663c66dd9be5d29dfe7438cee00f4d82c6bde944f85a4d13b6646aacda1b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=game+of+thrones+season+5+episodes+download PDF link annotation
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/a6j2ikvord5pg2fvo1mqko20v0/55939815509.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/91869066817.pdfIn PDF document text
    • http://qca.ch/userfiles/file/jimibexe.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b284025b2---nikezipupomidafiwov.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///mikabatu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/561dc263b559aacf5ca638be5a0f2844/67814113706.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/74267112318.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/97173576980.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/10bf01c3fb4530377c281dbee5bbd579/xifuzujonoki.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d277e75b0fa---tofodisipaf.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071c81ab7629---57989920727.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/483a5c1b2a2882176178c4876cecfb0c/59179584210.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c02b13140---35278768505.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5fc573fa---64314617250.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/2842153902.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/16094862488.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2733fa8b59---zaratowikododekagegej.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1bbc1de4---18881579242.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/70627999491.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/koxonavuko.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7af19eeee3cb8f1248a41cc3aaaaa306/87737113265.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/murulafepuranokim.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb83d9233---97009775468.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_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 11020 bytes
SHA-256: 2315c8e5c1ae28a46b90d01bed9628044b4ea688c01ac6a3a5912cddb39ef6ad
font_02_sfnt_off0001399a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399A 17188 bytes
SHA-256: 533686dd7bd65c54947811c47a9621c6c969d0d9d9673633bc68f11ec684920a

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