Malicious PDF — malware analysis report

Static analysis result for SHA-256 1767dd0053a791a8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 18:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c105f1323b6324efa60ee371a8147e05 SHA-1: 57c683e69aebb5ea8bc926d294f53b18e7394593 SHA-256: 1767dd0053a791a81ee69dafccc5a28588e6d5f6405469828d2eadbd01d7c24a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS upload storage and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=36+is+prime+or+composite PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4643808a2de178f587d494bc2e5b08c3/53551205596.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/tasuzamixidulixobaxogi.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5d30740a---58153527718.pdfIn PDF document text
    • http://www.og2c.com/images/file/rumulawosumolapobax.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/wirekokinovex.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/raxobokafofe.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210903120749.pdfIn PDF document text
    • https://www.confirmedtour.com/files/vixogugabitizaxaroxe.pdfIn PDF document text
    • https://media-get.com/userfiles/files/2809327894.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xakunonulukewe.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/werabipoxabovudaruvok.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/tatewimagix.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109141259231223.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wazonururinuvafazasozo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d292de0e2d---83592562628.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/46518012345.pdfIn PDF document text
    • https://duel.pl/userfiles/file/dujamoriwoge.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d8cc2q6krlom7i26mkipdvo2um/wetetijasogitisitiz.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/bigutudu.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/50488351706.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/72798550770.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/kuvokawexiv.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/62642233210.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1ddc25a8---notexezofelix.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_off0000bce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 17104 bytes
SHA-256: e1eb854d4b1882fb15682441a42683db292d79c072d8882cb21c02701039498a
font_02_sfnt_off0001018f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018F 10464 bytes
SHA-256: 9c8be7f18eed52f379df9d875b4688b21da6a74de6cad7575837c5a01d4c9b22