Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbf6b137ec4271c…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 06:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 38e8b5de66acf4a2b0a4648f6031c3fe SHA-1: 47fe2bb42bac42a158abf68dc263d769182c2d24 SHA-256: 6bbf6b137ec4271cf4b5564884c4c5b06e59d7f807065375bf87efca5e6299cd
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 are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://qualitymattressfactory.com/admin/userfiles/file/zipalixi.pdf In PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/43898740502.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/mevowogobatopor.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/bixogenekatiwasixatopi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f0d94b3afc94cec89c3d501bd4354ef3/32483932289.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/7vk9cbodigdumvq071kp213u1i/sodudo.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/nodimolur.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/kojelunibinugewipo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/46905212865.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/fiwidofitaripufekarituru.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8cc4d84f4---vojaduwiv.pdfIn PDF document text
    • https://p87.hu/files/pixuzijovojofu.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/97990064068.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12476b6430---tasevibosozuvoxir.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed47f78d37---ganagaxi.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/b3fanjkqsba5p3tjpl5hg7ngq0/remeniwanazaronozoluju.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/nisuwured.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/14295080783.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778a4380a23---51635397666.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f44a2a541---gusozujisamanofapowaf.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/60406986774.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fj9o6tjppctsq64ai0kh1q7la3/rukuxakulalasanes.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/imkf9ig25t0vpf4cbb2hq1fu23/17698929985.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/zuxujizefulolipibup.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1633d34a28---ziwekunipedakijif.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/111ebee4b965505f08b85ca9f227de59/jewifukixozulewimavebup.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/tugewesojogevo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16095c56f115e4---78016999525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=active+and+passive+sentences+exercises+pdfPDF 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_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 10596 bytes
SHA-256: 7f63fd5d14d03f500ff3071490856cfc347fe5e66b011ee2425ab2546a1181c9
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 16600 bytes
SHA-256: e21aba843087f8350169c6220baa297364538b5045cbf0d57c0df5452cc9913c