Malicious PDF — malware analysis report

Static analysis result for SHA-256 274b0ec196ef831d…

MALICIOUS

PDF

85.6 KB Created: 2021-10-13 07:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a75c4ef60fd463b3ec434f95c94cd9d SHA-1: 31718616306575dd51919143c88cf87a57b996d1 SHA-256: 274b0ec196ef831d0d1bc2e5f63418c84457c02ff0f602a06ea5ba3499f4dc57
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites. This suggests the primary intent is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=the+galaxy+is+endless PDF link annotation
    • https://baruipur.org/ckfinder/userfiles/files/67467600212.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/40611183261.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wozoxoxutenasux.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a98332ba8e---12318919712.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326730dc70b---38905603172.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/14184664172.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/limenixagegatawavexajis.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/fakoxipexexus.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/85469860119.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/81715085935.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/99083201017.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/32999829768.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/84264709211.pdfIn PDF document text
    • http://clubblink.net/admin/upload/file/69367745571.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0073259001633021502.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/06205748271f745a72a248f495593b81/61895416021.pdfIn PDF document text
    • http://7878.ir/uploader/file/85076595962.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zegifunigivesivon.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/79016654617.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/dokosadan.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210904170023565.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_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 19880 bytes
SHA-256: 02fc6328bdc4e2f5574c3f6ba69899148fa19ab926216654b0fc07678c9e323a
font_01_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 10388 bytes
SHA-256: 1658b448723f0ac39f479a206f9d14ab3f975eeb1765535714edab2d390b3af0