Malicious PDF — malware analysis report

Static analysis result for SHA-256 a756ae9c530a8964…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c08abe12a46462a1bd6009e23e49291b SHA-1: d529bbc211144c8baed55ef12a1fae6759da8403 SHA-256: a756ae9c530a8964eb150a4449b8a82437ff96e7ead03d482bacb3ba03423f37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

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 http://lachambredechos.com/userfiles/file/50438241822.pdf In PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wipik.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jafulexofijuxanexulaxopu.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/37a93665a1cf9e2b3a35c89d38f16a5d/fukomev.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/72000442212.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wuvipanet.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/71580491546.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/83660171478.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/37726742003.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/67863761701.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98042792391.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918182141_ptg81l.pdfIn PDF document text
    • http://sin-hua.org/userfiles/61355803448.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/wejugadajuwapuretorebexur.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc3d1043e---faregorexutomiwofex.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/ridefisuwidejagapezed.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/pazuwekedatujagus.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/72341043314.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/rubovazefiru.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/15438945520.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1b78141f---20465621624.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/kegorixejorowuzidu.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gosasiduxomo.pdfIn PDF document text
    • https://foulardfotografando.it/file/83784019482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=monopoly+mobile+apk+downloadPDF link annotation
    • 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_off0000af58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF58 15272 bytes
SHA-256: 1c0cd2d483bdd1dbc5cb1a5abb06b6ea4e9a9fb461315995f02810a3a7c49bf5
font_01_sfnt_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 10612 bytes
SHA-256: da7eab12017fd450e01b056512721e05d1d2781c73eca94b6f69ad3a92016b52
font_02_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1