Malicious PDF — malware analysis report

Static analysis result for SHA-256 203d6a957c787edc…

MALICIOUS

PDF

82.1 KB Created: 2021-08-21 05:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 602c94c21d46b7f47ce0364b8189b9f9 SHA-1: a45cc1701dffb338014b8aa9d63211d4dbe64be0 SHA-256: 203d6a957c787edcae741582ad7c22d56819350c7e5be38eaf64a52723d6957f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 http://caopump.com/admin/userfiles/file/4000483081.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d856067bb80---lebawalitofor.pdfIn PDF document text
    • http://sireny.net/share/files/90381524835.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/fozofuki.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1afafd3c7d---92936838403.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/27488903914.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/68098124f6cee24f22f1ed89e6636a4a/takatejumiboguku.pdfIn PDF document text
    • http://519pf.com/userfiles/files/78148484421.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/lowawigisizoxotavo.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9fa29630---ramibilizij.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77654f3d77---27474712017.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/10228976177.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/59867245970.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/fowubad.pdfIn PDF document text
    • http://ccmyungsung.net/userData/board/file/nuripetolafenoviwaz.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/sinekudekipenorexogonexap.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/xikemegegezexepem.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/lomitenunulomakan.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/xoxuduwirenosozojifoza.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/dajifemepawijupomir.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/201054593159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+is+the+price+of+lexus+rx+350+in+nigeriaPDF 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_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 11384 bytes
SHA-256: a89b841f8ad9d2e390f353d9c056f1d2aac322233139179e513d60fe90c79f2f
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17084 bytes
SHA-256: ecc9a46f645010bed4da6d32f8674446a20aa4d9afd2bbd601569a5b37549917
font_02_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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