Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5902ae77dfeb2fb…

MALICIOUS

PDF

123.1 KB Created: 2021-09-17 13:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 12b305ebac85d798adbd983ffde417a3 SHA-1: da1f95737ddad7a83a51dcb23aecaa870d68c253 SHA-256: f5902ae77dfeb2fbba1402330799c292e95ca2f472359ffd46bddfe589a6a6be
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to T1059.007, and the nature of the file suggests it could be delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 https://irlanc.ru/uplcv?utm_term=all+along+the+watchtower+hendrix+tab PDF link annotation
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ruwipufipabimusigukumonil.pdfIn PDF document text
    • https://bnovum.hu/downloads/xizigalagojudununufuzobar.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kikuputedimaxev.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zomaragajetig.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/musiwosotobim.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/xobepoxuxojaz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d71b064c---87214255278.pdfIn PDF document text
    • https://fultoys.com/userfiles/tatetoratigefoga.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/71905786256.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971d9f4137---dukutogaweruvarevazatisib.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/vumaxakerotobajosupobume.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/zirarubuzedamupibibiti.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/69653024147.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/redejerud.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/16354896220.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/jobanuwimeber.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/9243346722.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a8af383f---nodiruxebifafolumim.pdfIn PDF document text
    • http://poultech.net/d/files/ritafakena.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfe27205f---76423908019.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/19619951613ddba7392f0.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/weresuxodowivobo.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/vifekirivunujerawa.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/53023745606.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/30245585765.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_off00017ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC1 19556 bytes
SHA-256: 8010a5abd220a20729c6ca8a44e36a4cacf4829131acbda9f41f8a458512118b
font_01_sfnt_off0001adcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5E4 10792 bytes
SHA-256: 227199904dbaef067f5c1938102e4d95f8b536b15c6f9b280e24c36a2f7aa62b

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