Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c9d08b55e080ec…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 15:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32e1186e0d659365c2fa8c9f49bf0415 SHA-1: 2cb93b8b7f3eff41bb231589158a158c4d5cccd9 SHA-256: d2c9d08b55e080ec31f776d9adb86884dd297cf4f400287dd6dfa0ae583b4e22
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier strongly indicates maliciousness. The primary purpose appears to be directing users to external sites, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=kolkata+road+map+pdf+download PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7acdb7b0b---zumuzarogoxuza.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/zedamutupuled.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb2466559e---zemitu.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pubelovexukowabadilivaxu.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210818042223.pdfIn PDF document text
    • https://rotitelor.com/contents/files/pevupobik.pdfIn PDF document text
    • https://activepymes.com/pub/file/4345586279.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/temipamuziwagitogibalunom.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/22525743896.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/legiwesixudanekafeni.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/biobqqi98lehd3qq3r5aqf38jq/zigerawakela.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/46056066468.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd0961daa8---9078767176.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/b6dvft5qh555dvsgvmuamqjm32/xejitorivexibinutono.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vofulisonorafupitisoxabu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e2254a2332---pozorafejatazeleluzobogi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/72b5cd84dc3ad0e56aef9dddde3c5453/borumixazegevosunedi.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/defenagokiduk.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a32a9a01910926a3b47e1875bf8433ab/70033110671.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/77970516202.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6581aa6043619b43970e15ccc9c2545f/4493973894.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/03cdbaf4043829798e02bea10ee8f727/16040547356.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/tonixilomibotadokel.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
stream_005_off0001142a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1142A 10436 bytes
SHA-256: 1fd8b0b887944db096c464c1bf02f9669582125d13d536bab9c16b02177272c9
font_00_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 17056 bytes
SHA-256: 0214dcc0e23155a7c8042996007ffc51b3a37f00dafa9cbc6c7382e2696c351b
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1