Malicious PDF — malware analysis report

Static analysis result for SHA-256 de379de8f3a40300…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f10eb783f1b8ae393f3a5b709b7a4ff SHA-1: c0fef347c545113b681e41c6519218076f46443b SHA-256: de379de8f3a403001514db3106c8702440aeb78f84a6448e716e7ad4df9bcfe2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/slr1078212qfe3ohr3uuthfcb4/zetuxisolivimolis.pdf In PDF document text
    • http://caffepontoni.com/uploads/file/lulusaripo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sonepuxuzanupidite.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7p0a8qtc89sm6kv6e5dvlgu0v4/44965472827.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/bpk0o5s0r9u8qdlcqe6kveac32/mirujupapapu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/dujivi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3jmg031fdc3c5io26qdd02aoq1/73714039325.pdfIn PDF document text
    • https://citytrafik.nu/images/file/doferomoremarerozoweri.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070416313360.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/odrrm86l6r8mlk3kajmscpil5p/tagupomot.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/22997387596.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625577321.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nluoe1i0n5126r1t3o96ll4pou/25575150391.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6ad784d2---7836015121.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/49312414439.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160923c7b3b164---99977811555.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/jevisasu.pdfIn PDF document text
    • https://pindimana.in/uploads/file/xusajasetujipuferusoxesi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06bc715c25---81857653878.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/03qutj3i1pctbfakcci4ff47f6/surojuzin.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/15bko1dtg5jg9m1sft82r79c81/96585081458.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/buxumovuwunobimesej.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kuborel.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/41879569898.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/warixerupuvutusir.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/61168215268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+long+to+keep+nose+ring+inPDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10432 bytes
SHA-256: 6f70b3ff94964a1a96cf44d2dbcf85dd2775f03dee99b2ea8f63f6fbbf86b2e5
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 18508 bytes
SHA-256: e041d2e785046ba0b8e8ae7696c2f6e47a7f29bf20673a7a6d9388f8810b5367
font_02_sfnt_off0001399c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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