Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5ec2a06747b320…

MALICIOUS

PDF

94.8 KB Created: 2021-06-25 19:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 395372a0d6a29cc29160da2921291b5b SHA-1: 45374244d69053aa884b0774f48474d11d5658ff SHA-256: 6d5ec2a06747b32072718d9aa2cddc61eb329e8f8e23a6af46f29598432794e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The sample's structure as a link farm suggests it is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e404457123---81781798737.pdf
    • https://sunrisepool.net/userfiles/file/47632122010.pdf
    • http://vo23.ru/upload/file/35070746384.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8303b82d---19884176381.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/st0m3sjdmpgtes0bs95vdfoucn/jipujene.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9a4736f0b2689885de5d7ca18c3b8df8/76355635598.pdf
    • http://oreade-breche.fr/userfiles/file/66552552309.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2ab0f73cef203b0a2014b9142b9f920d/wujabed.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f5udch21eu6t96e46ah38jjb65/fiximevedexemorez.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33ddfaed---55919776057.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6d1334506daf694cd4530edacec96f9d/71415042034.pdf
    • http://sage-chem.com/image/files/20210609_033124.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/89c227a3d9e51efcaeafbeca614079b5/46746792867.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080bcc1ae2f6---pifor.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8c3ec3e93053547de6713db024e57223/44366514262.pdf
    • http://shosholoza.de/file/betukojamoporafefaruj.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/46751190309.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f83af54a43dfaec1b19d71ffeda03562/liwoxipaku.pdf
    • http://www.520amis.com/upload/files/61301588961.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/c2ea1071c4b48bd3f9ca438b16c17c9f/38763429504.pdf
    • http://wtmongolia.com/materials/file/71293463469.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2319ede67---zesowejutamezoxovubu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=spirited+away+subbed
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea18.bin
8ddd065f84ada11e1968aa9b4b519bd4b272e596d7f35c045636d55183a39b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10628 bytes
font_01_sfnt_off00010261.bin
4486d6964cb36216fbc1634a39283782c581b54d0f4ecb3bfb6679f420657ad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 2744 bytes
font_02_sfnt_off00010e09.bin
23f2f1de06fc901de08738a4768def588a4fc87b9476d07a667f9fa0428c63cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 18176 bytes
font_03_sfnt_off00013e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0F 16792 bytes
font_04_sfnt_off00015620.bin
302bb86bd7ea47d0749a0a5129c1041f8db04fc7b010058a916aeee1e77a5996
pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 16244 bytes