Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc723bf8e0c16f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 14:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab8af6a158c08ff0c3306f029251b0c8 SHA-1: 28562f98febea6f236ba640b453025debeee98cc SHA-256: 37bc723bf8e0c16f5938731f2896ead42dbcfd1db5bb83e90387a24c3324b897
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to manipulate search engine results or redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robedecreateur.com/img/files/lixekigomure.pdf In PDF document text
    • http://ambvetesopo.eu/userfiles/files/35737646734.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564af14439---pazawimesixuxe.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/47324364830.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108b2ed15111---dovanetiti.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/9083210315.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/79885337264.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/88272632383.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/vobitiketibepus.pdfIn PDF document text
    • http://nprofit.hk/userfiles/96881912486.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/62146620096.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/xiravujadalomerufaf.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ad5144b09fd08ef5bbd6a5cde44f368d/famupijudisozajikepesixet.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/difefefobedojenelomeget.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/715f63bba1a074e7b9399c0d76922dfe/49780278123.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/seriwikuwalanikagunubete.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/83444450536.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c31204c2ff1---75684212472.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e032ebcf5fe---wujozuzubiloxu.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/minepozatovarerilo.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/defibedajerusujunejud.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/vomoludejajol.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/11753766586.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/galugitanawobemuwokevowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=intracranial+hypertension+pediatric+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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 10784 bytes
SHA-256: 0a5ea23e4ed662086e6bd0a8b46a04a5c9f810f86259311a5fb9bedb7c4528bf
font_02_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 17284 bytes
SHA-256: aabc19fd664bb7203cfa441aae1874416d80207829716704daa2362b4f6dfbea

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