Malicious PDF — malware analysis report

Static analysis result for SHA-256 7826dbb8d53209d1…

MALICIOUS

PDF

94.8 KB Created: 2021-07-01 21:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2bf2fe843fcf2a3497e28ebd1832acb SHA-1: c647371c204e1b0ae959d6ca915a2647072e729d SHA-256: 7826dbb8d53209d1c9bfe0161943f60d45ecf63de7b20add896a7ade5d637a72
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801eaa649b2---13098708577.pdf
    • https://dienlanhhonganh.com/images/pic/file/burewogaxazilor.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfda4d946---lajofazisugapijosunuvutof.pdf
    • http://av-jet.ru/userfiles/file/kojufogobew.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842e9317ac---nilowesi.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/0968f54f658d1f4017d39b64458e7165/fuxigudesusowulerufowonud.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608567a35575c---92952101363.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe283cabc---koxulonexaxunebumemij.pdf
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/jujapubexizuxoxaronaroxaf.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094023b33a75---nowelomifudumagapuwovafa.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ge62oua6kk9bnq13d0r9qvq3ml/27250598111.pdf
    • http://angelescare.com/userfiles/file/gazibofejufurutebuj.pdf
    • http://fabtur.ru/upload/files/bakemanezowi.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac26d3f0fa---muvixaj.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e498b72271---lewetivilinelarav.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d93544bf98---60922671642.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097778672ab4---gutuz.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tadn48cdr0j3band3tgg5q4t41/55433871895.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5a235081820023cec61aa46dcd3704a8/20205733674.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hc2i02j5lrhvs5squb549tps94/11239615974.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/614a84f809f54e66ee34643229425dc5/13479375386.pdf
    • https://rijst.nu/userfiles/file/rivusaxigasojigezorebujig.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7e8e0ac81308e6f1462f7b8ef09584ca/kajinuda.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/58389394005.pdf
    • https://gmnavarra.es/ckeditor/files/zasotitemumox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=frost+mage+leveling+talents
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001100c.bin
fb53c46545f124bdb13f39edff0293db1c44bcf118010b18041f5083b03fec0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 10492 bytes
font_01_sfnt_off000127e5.bin
47ddc16d4d157e200b0ba1b2f136179aeaf619af7df78d839a027d758a42c8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 17912 bytes
font_02_sfnt_off00015608.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15608 16792 bytes

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