Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f115602b0c788b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0aafb084a7bf04980ad20f571dda0f3 SHA-1: ba1b996308d3e9bf09297b5ec001671f9928a738 SHA-256: 04f115602b0c788b0dfa80b009077bee6b262b36e4c4bd169ea67e8cc6b2ebe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=usb+reader+apk PDF link annotation
    • http://inbjnews.com/data/cheditor/0603/files/gekakukezu.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/nogudolajozumutizavakifel.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/tujakojipobogumowuwode.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/39943434745.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/92479461207.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137df65a4baa---61533463884.pdfIn PDF document text
    • http://hodori247.com/uploads/files/32477970063.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/kejut.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/65108261103.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fac25f17---matuviv.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/duledamojonuzux.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c3cdcd702c6abdde8e3ba84a0c0b9cc/wepuxilununudizud.pdfIn PDF document text
    • https://binhvi.com/upload/files/5290586995.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/33479860196.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/l7kpko3o5s26evtisem87pqcf5/laliwitovitefax.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gosegefogumupuw.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/87306709182.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/fopel.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210905_F6925F1109565897.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/woxejem.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/gewidulogo.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/rimegatebogun.pdfIn PDF document text
    • http://goodmax.ru/i/files/pekokodibedejaz.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
font_00_sfnt_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 18484 bytes
SHA-256: c8d2aa0044c6caa34c33ab33e52e1232b3da05280eaf776f4d306e21b285734d
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 10164 bytes
SHA-256: f704bfd255219c1480ba1ac7b97aab6247cf98b1283994c33fe322342a61bb13
font_02_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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