Malicious PDF — malware analysis report

Static analysis result for SHA-256 f553cb0423346ff2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d4086901a52be6582040d4a98a85052 SHA-1: cd52cae92f15ebc6c9cb6def01fbf0abb9ec8392 SHA-256: f553cb0423346ff230e9697e4819ad8b1ee06a757275fe623af4e8a20661e132
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm designed to lure users or for SEO poisoning, potentially leading to further malicious content or phishing attempts. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/69623254210.pdf In PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6sio9pi05i9n99a7fekehuqtd6/kolusugosekexagubumifex.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/290d347f60bee415fbb9bb666537f78a/nejoremetibujozo.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/wifexiwakajelaka.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/71f0ee73bf9377805af3b94d9a0d6b60/wesojudisabakusazep.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/50324541506.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/10129960213.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/70c14e8864abd98e90430e937b172d4d/24802839665.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0pb1veblsgobhqqfsr96dop9b7/23672885881.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8edecc53f---bitasuxage.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/82c5d651aa6efd94298faa3edd3163a3/96514427043.pdfIn PDF document text
    • https://tepihtrava.rs//files/86266499300.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f9c4924---nebonokeledapekuxumare.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/62270caea7142d8e10a6f4922e17ba17/kixafunefupunaso.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/60939443804.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cced5c6b43---13840579514.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6227739408.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609262b8ed4ed---sikivarero.pdfIn PDF document text
    • http://dnepropress.net/files/file/gizaxutakaxifatifixuz.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/penodakobumiv.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e2c63b83---tixukaja.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7392f3dbc2---63232952813.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67abebe50---77488512336.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zezoxadufasibodom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lime+soda+softening+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_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 17104 bytes
SHA-256: e9ac5c88a887746646f70aac4ce117c0a9fb0ec73a2d98c9127e31dbf7510b98
font_01_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10652 bytes
SHA-256: c2618afa915be752cf6363480b18deb59b00dbcccfbba9e270d92ed3336ba061
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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