Malicious PDF — malware analysis report

Static analysis result for SHA-256 307cc6322d69da9f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 05:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55cec856b4af6c7581adb6a4130df491 SHA-1: f24bcb95fd0389e28fd73d75c7f8ba71a02c7040 SHA-256: 307cc6322d69da9fcbdfeed2d8959029074f578164d2675bd350d68347f5ff13
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure strongly indicate a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=how+to+get+all+images+from+gallery+in+android+example PDF link annotation
    • http://ambulatorioveterinariocamali.com/userfiles/files/24773760007.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bibododok.pdfIn PDF document text
    • http://asid.rw/userfiles/file/ronibisozit.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/rovevuxulinawisewuwari.pdfIn PDF document text
    • http://jljemc.com/upload/files/90735250578.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/fiwokoluje.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/libisog.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/letejiwanomanevajuro.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/926a67lc185k543u97j484gtp3/40670187155.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cnuoc4j4q1c6tmsd97o85kcujm/vozig.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bimamokufalexidisov.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/sapim.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/5973331571.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wubakerakolazoxawuk.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xarikunodokezabo.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/dotinepofanosekaguxopo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fd559975---66149181069.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80870446458.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/rokokabateda.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/84303073252.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/mitosodogakorogegikanale.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/tojopew.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_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 11136 bytes
SHA-256: 998d74e0ead031fbe125d94877860dc24126d3d4aa7837654a7fd1a0f001f5ad
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 18664 bytes
SHA-256: 5247787e89de462237fb3d4fe433a5f52520fe41233d9634e3e766c0ffb1f097
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1