Malicious PDF — malware analysis report

Static analysis result for SHA-256 28425a2df7faa541…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 01:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2907d600ade2e06ca5b2916b323aedfd SHA-1: 17c3f29dfb0895406ad42ce454c450f68cc14cb3 SHA-256: 28425a2df7faa5410d02706e1981bb30e10d0856bcbea1a97267f33b9df22489
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to a tactic of obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6d7d15967c23dbca5e943fee49879735/46304329530.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0k2hrnrkcd9nl3p2eu5lm1socc/dosetemuvegugoxarapiduf.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/pumezunigag.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/13716986724.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/wonux.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734f6bb02a---wimolatazapezopota.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf8c72c43---ribitojereforok.pdfIn PDF document text
    • http://thaide.org/userfiles/file/65209161837.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qtrh60kjt7q6esva6iutteipfo/98710122036.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c69580456---robemosetejovelofimen.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/momimi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a153f67e36d---selezaragiminagal.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe708834c5---bositusojiwijekidane.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ifixumusinez.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c121d82ce12---gubogojireb.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/398021d664481ede13187e390506fcb7/73107684267.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/059064b4d1ca6e72d99e650adac43643/bekoletogipum.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed57b2bf4e---marur.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/57056263175.pdfIn PDF document text
    • http://aviseco.ro/userfiles/file/joguvimegegowizabe.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/3750062729.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091827347776---bugafafanixum.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/wutirefuvulof.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/k4tspu56j72mit0chct7i3f5mt/wipuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=filmywap+south+moviesPDF 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_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 10656 bytes
SHA-256: 57f5f14fb4391a4e1cadc3adc0ec0696c0c1443bef2b614d8740ca81f209d407
font_01_sfnt_off0000ee36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 17208 bytes
SHA-256: ca7565eefa1de0ee595ad5694472428aa172b560092c9a0b368bf94cbafe3de0
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_03_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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