Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ddb71305c896b5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-02 06:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8401be85159ae2c8fdcbdcb18c13989 SHA-1: fd319e82a896e5c8f1012659093c59876638d733 SHA-256: 83ddb71305c896b54fc4e4e11a234bb641624da6d972fc1773066162f73d7e0e
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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 http://merwepizza.com/upload/file/xezejozipapuxala.pdf In PDF document text
    • https://ehlibeytalimleri.com/resimler/files/fasiwuxexegikilezegodeka.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c80a46dd4235c78c1c4e6963f373bc26/putudewarimu.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/85668722346.pdfIn PDF document text
    • http://nessium.net/userfiles/file/luvuginuzewufe.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/ruzuvelegavumavelapoj.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/86712463645.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/regoremi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/12094121544.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d91hnq8khvh23hohf2vn2rj943/godexumizafovetegar.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/melalar.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/pubidufetogikomatib.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/86230575690.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5tnr067bvpj06khbghc9u5dt03/21026180569.pdfIn PDF document text
    • http://df-2.de/images/daten/file/wizesepinog.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c432aca13---nitomu.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lejaramavomapetatepizu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/bejotalemibasebubejexukox.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127660a27fd1---gedug.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/42256114248.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/tegesojapobexifer.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3nhamtjb39ni2884eq3lsjeh59/80967374108.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/mazuzevuxogekoneme.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8729f2bf40---77793175509.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/31689834263.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45ac2b9e6---7725187184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bible+quiz+questions+and+answers+on+the+book+of+actsPDF 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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 18164 bytes
SHA-256: 230f3f6a14e699e9247ccc92c91b1ca210b5c528270fd2c67c35a802fb9c5f6c
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 11252 bytes
SHA-256: 65bf92050d516a140a8bd57d1d9e9d01dd1e49d599381c35fa985049b4867c4e
font_02_sfnt_off00013629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1