Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f474ddc8ab481ae…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 02:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe81396be9a791e82a6172ea86943679 SHA-1: 67c4a24e2e3a8c5dbeffbc2ac65e79c742197587 SHA-256: 8f474ddc8ab481ae379fbafc84b6f6485199b08aadf02f3bff0977b1dc3d9de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://telorgabus.com/contents/files/97913425322.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613576dc7f0da---16324956178.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/weziperad.pdfIn PDF document text
    • https://jobtiara.com/files/files/lovatiwotosaro.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/76992307274.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/8414152384.pdfIn PDF document text
    • https://unitjaya.com/contents/files/13989503708.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/20820463399.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/40479479721.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/pimobanujire.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/suwuw.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zajifu.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tagerejizijixufav.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/sutiwudumedimaz.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/11128017039.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/16407882909.pdfIn PDF document text
    • https://hiroyoung.com/data/files/96599159101.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b848a640eb87b182a50b10762df81156/16782940457.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/77636466146.pdfIn PDF document text
    • http://chinazzjx.com/d/files/gimonuwamev.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea0defd86---96857307208.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/81698917939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=overcooked+2+3+playersPDF 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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 10800 bytes
SHA-256: b98c7696e3b2cb539a8eae31366fb4ed9fb8c3b2132365f38258d714bd03cf6b
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 18048 bytes
SHA-256: 977216fd1b255a666233f176a3add4aa55750b1aef845af463479a3d83805c2b