Malicious PDF — malware analysis report

Static analysis result for SHA-256 52885bddc81027ac…

MALICIOUS

PDF

108.5 KB Created: 2021-08-04 02:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 025bb530eed3b82d55ece4b6fb381847 SHA-1: fe26d2045470381cdbf5d4c9ed06e0be6bfec358 SHA-256: 52885bddc81027ac060acef129ca160f84d7976ed74c3aea2cf838375fe70c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3c865ec8---70094747724.pdf In PDF document text
    • http://cezanart.com/userfiles/file/fatilakiwote.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/10803073533.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/gojodegasik.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/tuzotifavowalalojuj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60c7bf7ec---bibemedirizave.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea8fe7871e---58134833793.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tefagidoteleratuxupot.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc196d82a---63294101111.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d4df46d4e720d34477cdc11aff5bb8a/sixukixukibude.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210629140937.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/29200632843.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/maxukavevidurifikajot.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/tesadawuwux.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a27698db716---mizemufopunog.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dinumodebugol.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e2cfa29---89708371008.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091374fd113c---zipuni.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/29907884259.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/93be1c0927b535e1f61b7a1281bffae6/repakekadid.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/t6f4a8oibfqhk9301gv17jn016/36788964717.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607afddb9ded9---zakovonejexuwipezutumoti.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/69163826881.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/zijafikazawuvekesaleri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quran+surah+rahman+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000147e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x147E7 26556 bytes
SHA-256: 6592e9f138050ef407ccda992ac93174b8e48eb92bec77ba514ad67fba46ba98
font_00_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 20328 bytes
SHA-256: d193ab4b37c32b5b2324adb2309f09701a8176d42803816b0e17ec3afea9d873
font_02_sfnt_off000174b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B7 10432 bytes
SHA-256: b72e12b1ea75dace08c2b53d31b96f0d925cc66713146fbc3eb24befb0469add
font_03_sfnt_off00018c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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