Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aa2a6e1fb19aa2…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04d92cab157020627468189cb991ab99 SHA-1: 6f51e669bb8c624f8d1f901f05e7f22b513f94a8 SHA-256: b9aa2a6e1fb19aa2408fec78ee15141c39f15b311eb291808ab1832049c7e82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, constituting a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fernandopelosini.it/userfiles/files/dufidilapetazi.pdf In PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0549b62069---88763662958.pdfIn PDF document text
    • http://susutour.com/userfile/file/kozoruzuwoxaw.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0a3d9c8535dc03d9f371e8386cfa79fc/rarimopizenipadekegivisov.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/n81f7egder2b4p3qvr96gv5lfg/xezufapuvenisemi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908dd2921c3---fokenasanudufinedawuwu.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/noregirobizujaxuje.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c647418149f---nagimexiwamuniw.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0605f6d82b322bea87ed8aa87d192741/rixekosi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c705227d1d0---sagubofitibibakilazofekot.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/30577762798.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bd83d54474caa9fcbc292a1c1fdbab6c/79446587067.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62310b9dd7---21008471013.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/tewiro.pdfIn PDF document text
    • http://budka39.ru/files/tanez.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/49778456828.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dccgoi793me72aintnamk7d7ma/11533096931.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0d57d5227fd2a6c01393d82977ad22c/joboxo.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/88004390920.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wepawipozuremoxeridaxip.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5e219cee1b068addc3bb351a3742a395/delitepozarutos.pdfIn PDF document text
    • http://polkovnik.su/upload/file/zuzeteserutanexuvuk.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/5uu7h1fjcanm5ccndoihbad135/92458674891.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/sifuferogoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=percents+practice+pdfPDF 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_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 19268 bytes
SHA-256: 4ffff5a25d4322de1b13487547ff6bbe409f46078a291a3ac9c9234aa17f173e
font_02_sfnt_off0001144b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144B 10448 bytes
SHA-256: c106c0032089d8629c351e944281583fdb73553aa7d063ae823d78969030c9ab

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