Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa5898de28796bb…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 21:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4997d3a8f021487b7d2fc899ac0d5940 SHA-1: 020f4f3d4f4987163c90606218856146d76e3a7e SHA-256: caa5898de28796bbded31abf2516b984f212ad46d850abc9ed289ce8a8c7f58f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious URLs, such as 'https://coretry.ru/uplcv?utm_term=sugar+live+mod+apk+unlock+room'. The presence of numerous external URIs and link farms on disposable hosting suggests an attempt to distribute malware or conduct phishing attacks. No scripts were extracted from this sample, but the overall structure points to a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=sugar+live+mod+apk+unlock+room PDF link annotation
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f48de1a---denudinubesaki.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/lawesunisomojiwarawajefe.pdfIn PDF document text
    • http://erdbau-rauch.at/8712495670.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c478946efb60836a7618999ca06b5299/nesobesiwegeloluvajojodip.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd0d4a4ad---37012419012.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e532a89c---58437740247.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/58838543109.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/rapivenaxonujeramuwed.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tifek.pdfIn PDF document text
    • https://suksesunited.com/contents/files/31355056680.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/36827429877.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405bd54ed6d---ramuxukazilokibatevu.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/56494364176.pdfIn PDF document text
    • http://autovoda.ru/upload/files/49114482688.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/boliwunonumamoguz.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/kofurobutubejuwudaxuri.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/40517472046.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/71304755106.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/zakiwoxivejijazonifuzad.pdfIn PDF document text
    • http://lagrupacio.cat/file/wipivebixilasatudub.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/sutuje.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/75993468489.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_off0000c335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 10924 bytes
SHA-256: 0a176c3a1e07ab44cfecc837a908526a4ec0d9ec9a4fdc3345417a9d27db4468
font_01_sfnt_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 17328 bytes
SHA-256: 887f301469037385f7acc20b679c8c7f05fd95e877c9ae31f09d92e86e8b1ccb
font_02_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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