Malicious PDF — malware analysis report

Static analysis result for SHA-256 115e6a9af2cd211e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 17:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e735eccccfde8c8d24c8782621f9dd22 SHA-1: ddfb98491b6fa59f17219cf70a9e4b3c90039d82 SHA-256: 115e6a9af2cd211e1b9c5aeb05a7082ed3c4771a6e11922638d1595a2b131a9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised WordPress upload directories and disposable hosting. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=android+internal+storage+other', likely serve as lures to phishing or malware download sites.

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 https://queure.ru/uplcv?utm_term=android+internal+storage+other PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6da0f405---53836064124.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/29992742618.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/mupakugazanazedevakumuf.pdfIn PDF document text
    • http://arsvet.ru/img/upload/lebusuvibu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613468ec903c8---sawuva.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xufenegofikirakom.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/pumulunadexinibagiga.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/lakidafudedemefusa.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/53056509450.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd1db8b17---99824584555.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/25375330002.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/vudamapemuwezadozunogi.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/tebukibegitan.pdfIn PDF document text
    • https://kopari.hu/files/file/nugikujikixezigosotixuz.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/wagoletezab.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/73007876823.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/fifezixixuk.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/82735478155.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/pixuvovuguvuvisi.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/miwabowojaba.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ke2tj1t4vp5n6rcce54ktq5mvu/xelipibijawosebiv.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/kidugugivijobube.pdfIn PDF document text
    • http://mosjob.ru/images/file/25528990707.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/bitufuwexasubakoforofufin.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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 10508 bytes
SHA-256: b52a5e5fb081bce5305ec8214bccb3546cfaa7011b19cc05dfa81c475330eecd
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC33 17316 bytes
SHA-256: f3e49305729abd326f2dfd92ba69e2b82b1ea327649d7ba5b1c132239b6ecb7b

Open this report in the interactive analyzer, or submit your own file for analysis.