Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dd83ae0469ed4f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 03:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cac945e04d11205dda6b046baa3d534d SHA-1: 2422b6020c3831cb4b628f8bcc2158f11a27719a SHA-256: 44dd83ae0469ed4f9f2019fab7284aa6f01aee92a27117ffb97c039050415f54
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely related to distributing further malicious content or phishing. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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 http://akekaluck.com/ckfinder/userfiles/files/totubebenijemelep.pdf In PDF document text
    • http://christopherspubandgrille.com/userfiles/files/82295600456.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/10269679509.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/52252161727.pdfIn PDF document text
    • http://househouse.it/userfiles/files/19584758599.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/sizugufebupiduniwoz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/969707b0e290b2dba5de546a9adb18fb/fudolizobarikemixajavipa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4098adc7---tapuxabijuwojozaj.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/86797167727.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/duzuzapowazitatekosiv.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/vazexisipavebapixe.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/d2f68ded52ad867e999ca46e05719f40/zakusuwi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/74890635705.pdfIn PDF document text
    • http://agrion.org/upload/fichier/78299619000.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/37516776541.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/jipivonedowopusaju.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/53711688595.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/61371735785.pdfIn PDF document text
    • http://iucecb.com/files/file/rakosusizul.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/75925738352.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/94833901219.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140794d79289---46063179421.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kezumijo.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///40763191680.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f5a56e586a5997b93e9938c6dfea5256/bazurozedugoliru.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/18479441402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+vpn+browserPDF 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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 17656 bytes
SHA-256: 153f412a09020662d0ef43819ffbe51f5633d5ede9e80c247bd7949d22fb7bb3
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 10684 bytes
SHA-256: d3d3e2bbdb6444c30591418b1ce5d844a3a0939eae48446affa1902349168d27
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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