Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad1c9b869a0102…

MALICIOUS

PDF

74.5 KB Created: 2021-07-26 14:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7859d25f4d5bc53b6ac00f5a63d06024 SHA-1: c8b0efa89203cfcf57c4f223b14ea16ba3711e00 SHA-256: aaad1c9b869a0102802d5a7e7c2ae847a22016b4e415bc53ec1d973e74d0e98f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/96178017209.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sor3pv204b4ia7ji7amehd65o1/xozolenovu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1d58504f16f1169daf419db95007b538/dorilevudofomigukuxunor.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/ravolulolekonawomuzet.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dac0e79d7---13618965880.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/gunimowalu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a56425c82---nuteserekibipufixi.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/xexurulob.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/mofogobalozafifivem.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeccf2049---32062930045.pdfIn PDF document text
    • https://argumentua.com/i/file/semasiwuvaxaga.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/abfce6ac4a1f91d2f3d24aa8c675bac6/jirovolemo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/18d6579694027385bba425d8ce360701/20319671128.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/fowunezore.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ffbc9431---tegixizezawofage.pdfIn PDF document text
    • https://yuktogel.com/contents//files/jebeku.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8nl0iii83h3i71r3ok6poh5qlp/76815859544.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/99431181398.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6beac0d92e423e3728ecfe8de128d158/33705212199.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/26efc2d939d9adf008f4b17a734c62d3/2167092898.pdfIn PDF document text
    • https://activepymes.com/pub/file/89158719667.pdfIn PDF document text
    • http://djpress.pl/Image/files/xixuwomiganatevaki.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da3260529---rotuwarosuwo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/37743847463.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/80040761399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kabir+singh+tujhe+kitna+chahne+lage+lyrics+chordsPDF 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_off0000bd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD79 11216 bytes
SHA-256: 0dc0d7260498e088bc2c4d2c71b5ebddda31b72260d4e3f28215a80d584376f8
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16384 bytes
SHA-256: f5bf568d1e9acec70c85002275c58c7e2fa44fc196b548d1b90ff76fffa8ee44

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