Malicious PDF — malware analysis report

Static analysis result for SHA-256 039bba365ca9ff30…

MALICIOUS

PDF

92.9 KB Created: 2021-09-06 13:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21405098ebcb595e7dcefa8f96122082 SHA-1: 631c2047989fa00c194c6aaaf3ba0a5b9c8ae8e2 SHA-256: 039bba365ca9ff30935fe4d6a7557a53d4bef3a02b0ad7d0e9a23679cb4b9efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage external websites for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b4d5eb0f7---tisug.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7ac400947f41ae576d3cf226ab8193d/mazipunoj.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/30310750833.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607364d19091c---54882829965.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/97751235227.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d26b0f74---89759721677.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/migobela.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3711ecee60e621dacd17ae303b8dea83/balek.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents//files/bajiletetebitowekidij.pdfIn PDF document text
    • https://chp-travel.ir/data/file/57501291676.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zerexelumatisap.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fa0377i87e9g2erckp38e108q0/12552658695.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/76753248047.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/o5vt8qfgoadbd4hja1b24asen5/8733115214.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edfd9c63a3---noxojepa.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608386a15ad75---muxirarekijuwekapujamojid.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/xopezoteserabububo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mevupalikonewaduvulo.pdfIn PDF document text
    • https://mnlex.it/file/53741594313.pdfIn PDF document text
    • https://scalper.ir/data/files/file/326551531.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2fc748364339afd4eff949ac0c8735b4/7021754370.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/zuwebajijolaluvamunebugu.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/14217966716.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c22cb79ee---25405179574.pdfIn PDF document text
    • http://beijingteye.com/upload/files/zunivutenixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=list+of+english+idioms+with+meaning+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/pijal.pdfIn PDF document text
    • 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_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 18592 bytes
SHA-256: 534fc25562ee00eedab44e5aa60bde1fd762b90ab3123d55a12fba7c815c5acf
font_01_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 10888 bytes
SHA-256: 4e666a04ec195f81856a054d3727125d28e35b37d4cefaef529a8d2ae35667b4

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