Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45c03a556688aa9…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41cd71a0651e50f1944d17a2be1ec9cc SHA-1: 455c2abe6c03daa29c1c6cfa18af726e222479a0 SHA-256: f45c03a556688aa93c4044ce7a0c185466c9a5257e275a8d9569dc02df8bfc9c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common phishing lure technique, presenting itself as an image to obscure clickable links. The embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms or disposable domains, strongly suggest a malicious intent to redirect users to phishing sites or download further malicious content. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://synerhu.ru/uplcv?utm_term=best+app+for+keyword+research PDF link annotation
    • http://acelybio.com/upload/files/muperamutokidagamefopinax.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc4130aa59---fujosijogufir.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/sexugalamemotubisabum.pdfIn PDF document text
    • http://ned.ru/uploads/files/875787304.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161356d70e295b---bakivupamawopoditoge.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/dizosej.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/96251176996.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/gunevavisoj.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/97937712310.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/divobip.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147d36d0da6c---jazuxixewijevabe.pdfIn PDF document text
    • http://szcftz.com/upload/25214573834.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/fedapimanavami.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/19657411258.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/18218567074.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/bemapenijubomamirabuju.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/89102150960.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/vipolobasukarunigaza.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480417c2fc0---39827429566.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rapabidagivuki.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/xuwudexulolivisagip.pdfIn PDF document text
    • https://susta.vn/userfiles/file/likolifodesigis.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbcd8d8a7---wudutovivuronexijetepevem.pdfIn PDF document text
    • https://nichebearing.leaddeehub.com/userfiles/files/lawez.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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 10820 bytes
SHA-256: 596139d9fa17f2c42573d2d4a430fb063d94c01e3d23370bdde5031467b8cee0
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 13924 bytes
SHA-256: 2c02a97dc4c1a83d8f22bad2c2fb6c06bd14e9467af5af03546ef79933819b31

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