Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87b1db03cf89b9c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 07:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc8d01ee765e26b612484d440a2d21aa SHA-1: b4528d430e9cba6b544ab0e745ff90de9340a3a2 SHA-256: b87b1db03cf89b9c65c78b4894c1b9b0a2a808b7eb5cf67355de3a16e2c1b37f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a common tactic of using compromised sites to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c87e13d7d---sipifixurelal.pdf In PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/newitokudijojona.pdfIn PDF document text
    • http://wdnederland.nl/file/kitagajaxanezelifulu.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/60019042396.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/topanifajadekoxunubedaja.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/61285850921.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/motaluvuzedagoba.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6c3esnilmo07os2p8anvamuh5r/82121323999.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/59189558049.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4650ec7a7d---93195542860.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/vakid.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/57212049806.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/c16383b47dad019e23ae1ad35396f9c0/89458345163.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/71231505503.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6e2175556dd87570c95afbf31a5c7568/89492480555.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/fatijisoz.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b6d913c2---61338634253.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e88b76b53---bugudivutoranopigo.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/37486715662.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/wulobejovuwuvexokobol.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/duviwajasobebitopipirivak.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uujcno3hvguk0p0akn25s6rte6/64575444509.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f010f4e5b4---werefufufikale.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed334b968---85616452308.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/40457578089.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb5cdcc17---44220164061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=types+of+complementary+and+alternative+medicine+pdfPDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10924 bytes
SHA-256: fa1d8da29820470f7130804c6362686d543c331d59177fc5d143f058dcdade94
font_02_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 17852 bytes
SHA-256: f0f693ee242178cbe5e84ceb7e61d525474bf2532678771a41a1b62b6c12cabf

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