Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc06c4bb46ee2c8…

MALICIOUS

PDF

90.5 KB Created: 2021-07-15 18:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5994487eb8bb3ebdc5b972f0643009ab SHA-1: ec9642dbf0cdf1d1e171c5cf4d27da20d97f4ac0 SHA-256: dcc06c4bb46ee2c80e65d70d27c6e43bf2709b5d2f4bd23e6b7149eee5691519
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt to lure users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://bestapp4u.com/admin/uploadedfiles/file/viloj.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ea25bc8e7c9dfb0d3fbe6bfe7e0656d3/56451871220.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5d9044be---47029676165.pdfIn PDF document text
    • https://castel.ro/userfiles/file/92366211550.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/vodiwasumopazudiwevoxik.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zadebifojo.pdfIn PDF document text
    • https://actorconseil.com/files/file/fejubi.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/95921516700.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b3c9ea5b19a66721714e5ef0cb1eae48/99828902388.pdfIn PDF document text
    • http://industrialdevices.in/uploads/93087075352.pdfIn PDF document text
    • http://goref.ru/files/file/balamoj.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/jumopalugaji.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462c556c5f---84753042614.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12bdb38166---56218534042.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/mosonodonesuxujefebes.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bec739d8---bodetuziwujazuku.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825862bb458---nivifeli.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/1ee55226d563aaaf1b86048a1df4fe13/metopamitamo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc84134546---26837821224.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59579508203.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabe167037---48414945248.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/g8oc05iq2brah6mpabkfgd48u2/piwavurogexegokuzar.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072151b2cc93---91601157078.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe8dd6104---wunutufalufexotomesor.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/topuz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/47qeh971bcu6chg12m375k9uh9/1945557768.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e4d093e18---nozezar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=roblox+all+star+codesPDF 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
font_00_sfnt_off0000e817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 16428 bytes
SHA-256: ea586f803e69a767c658dac3cee3563864f042547de594a7a6b7ddb73541a3e5
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 10456 bytes
SHA-256: 724cbf09313ff1a3445bf4edf6149499d9ea712ad7d64d4e6b584bfe2f27457c
font_03_sfnt_off00012edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 17328 bytes
SHA-256: 9b732ed7eaf279cc4b05371f3194c678e8354aac9d21c75e15e27658227a5fa4

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