Malicious PDF — malware analysis report

Static analysis result for SHA-256 088f8398190b7657…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 06:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b74853d4cd238e0c8504a1fc82ee3321 SHA-1: f927d4d76db5cdfb74672b1c20f7d4c5f21cced1 SHA-256: 088f8398190b7657eb909fd281dcdd0b9f7a4ebb0a480507859d3c79e8aa46a1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with UTM parameters, suggests an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=agerigna+amharic+keyboard+download PDF link annotation
    • https://wietsevoermans.nl/ckfinder/userfiles/files/bazik.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/89384584599.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/befuzawenagaxapi.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210905095423.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/38691606975.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/71648793260.pdfIn PDF document text
    • http://rld-carbon.com/file/mitorotonefunugipema.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/7742739714.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/puxovafaneso.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/94439661037.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gumotopimazew.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffdb22ba90---refure.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/xarowekale.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/858d6cf796e1707585294e618d3ba74b/46031981420.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///25064598034.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/gupifobo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8tqcau139ll3vte1bcpnpjs6ic/vovovavunukoduginezoge.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832af07ef6---34801949596.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/wopeg.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fc01fd82e5f1537b0967cab7a67f5622/fidurifamurebonelege.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135b42fbcb68---26856316265.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210913020745.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/45723206826.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/xepejiruvetewamawos.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_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 10964 bytes
SHA-256: 08f84fd8c6778784f513a72b49d45f78c9c2528ae0c77042f59c2c3591a2cba1
font_01_sfnt_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 16000 bytes
SHA-256: 740005ffdf63470735c9120dad30bf60f77575cd271c91286ae16b8c7003673c
font_02_sfnt_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1