Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a44a934efc5657f…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 00:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 746cd73f4f4b08598ebefb4381199c8f SHA-1: 1124d4fda435d67140cfddc041745f6f12a4e566 SHA-256: 2a44a934efc5657ff3a63833d4f94cfeeeb8fd1290d4320953c5eee6a574ba26
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=the+walking+dead+when+does+rick+come+back PDF link annotation
    • http://nedirajtebosnu.net/userfiles/file/sosuxaxip.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/38024290560.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/15876872535.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jekededajinawelevizefo.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/87556249204.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/popub.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/nujivovamufug.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/pipos.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1148590f05ea11e2d7bdb4fc8d727c4b/76174007701.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b8cd9c67---87947093388.pdfIn PDF document text
    • http://apcmagon.com/userfiles/61246097415.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6d8e6db298d87a8fd00b52a179052844/zeluresaz.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/sudakamiximefedurojov.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fawuguworupolerexavasoful.pdfPDF link annotation
    • http://ohana1bbq.com/uploads/files/4183091592.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904102032.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/26934661067.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18996628948.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/bepatibipegawudexewagudi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04a6653ba---96661722327.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/55563705150.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/99813559770.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/vuwoguxavepuwovegipi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1cd83e34f3e268abb08315b2111ba86b/96583148753.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5bff20b4---pawuduro.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010d61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D61 18124 bytes
SHA-256: fa0a80d764bbc33d471ea9cae1bfa978ecb436af66e96ca322553129d00c0448
font_00_sfnt_off0000e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17F 16912 bytes
SHA-256: 4f92d2f92e001f304a6689667fdb11c72af0c5933f33a7f06e5b5c9993bca969
font_02_sfnt_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 11000 bytes
SHA-256: 48b73470ded81da7781b98fb7829e61342cd00dc906e4616bf626106dbe3747b
font_03_sfnt_off00014360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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