Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aaf4b158282f3ce…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 00:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22b06fed5325e29c0212cce7a96eda84 SHA-1: 9e24c5f582797357b4b360d2de16247457cf4db1 SHA-256: 8aaf4b158282f3ce630fc591a267c65bb763f19ac028c652db1ed36cf0ca9967
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely to lure users to phishing pages or download further malware. The presence of these links and the overall structure strongly suggest a malicious document designed for user deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ageddfjtj.pretty-match.com/upload/files/37761852521.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138267ac1c0f---26622586025.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/pafagasujadunakozomolib.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/62589ffdb7ec0c82d604a12c9c534b2d/38797092542.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/vusozunifozadawuwit.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613479dac44ec---fefulapatuxobifuv.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/21066125505.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3df2367d5---taladipanurawidorawozewi.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/laloboripixabal.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nabalidibiromatiwa.pdfIn PDF document text
    • http://esistore.be/userfiles/file/68257400004.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/82940425186.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/701aaea7e9fe255feaad83c2bc990bab/56386614514.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16138e4a10db80---73490082049.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/77060576102.pdfIn PDF document text
    • http://builderall.info/userfiles/file/wosizutaritisedas.pdfIn PDF document text
    • https://blugarden.eu/file/goboweniw.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f12fa5e5a6---29979456750.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/44964934930.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/jifizaredogige.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090822574218997.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/62744695811.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6kssc111evh3bdc667niuhu6o3/xemebanoduxu.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/53358212260.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/85551820350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hello+neighbor+highly+compressed+androidPDF 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_off0000bcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC4 11108 bytes
SHA-256: 9aa975994d16da9e4615dcf2a92805757e3747b69366c739f84ba380972bd6ab
font_01_sfnt_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 17816 bytes
SHA-256: c672306bfbc33ede3425c16ca1a8c440cf7cbc363c7db283fdc50588061a0643
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1