Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0b49755e70ad39…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 02:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1e589940100e22200b0b3c5c69102cf SHA-1: 9b05109f3954291b543fb8c5edfea2410664048c SHA-256: cc0b49755e70ad39fbc84a875782e624237ee43b1e343923127c645c4f03ca82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics reveal it functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to external sites, likely for malicious purposes such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pistant.ru/uplcv?utm_term=the+conjuring+2+mp4+download PDF link annotation
    • https://queensflower.nl/clientfiles/47304181020.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4q6sqigi2q84qi8llfsqq18b0/65903141955.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/favolofepibux.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/76203185903.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/bekegoxujup.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/wamazabitajanamiradip.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/70254106147.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/sutiv.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/kizumawurakufopoludoz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fee20c79ce---gopuxeniwuselowarax.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/defitebad.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161459328e5336---govawejugizodofifu.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/14554162712.pdfIn PDF document text
    • http://regcureguide.com/files/files/leguvopebekuva.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/21675618354.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/53618388505.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/nuwineruvaxetene.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/xoruvumijuledatotuxin.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xigiwitofovapovi.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/90838502397.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/munapavinifulubeti.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/47340223686.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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 17776 bytes
SHA-256: 2fa5a1deaf323f5a16d60f33bb0f9c8b781e7f3e96a8de9b5aafbb6adce41a84
font_01_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 11172 bytes
SHA-256: 1b95e8e7131ab447cad6bca2da9879902217f0f00004447bff9a82152f7f92b9
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1