Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8e801c8504e333…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 17:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2958325fc6d49de61d71bc2df5662947 SHA-1: 185afe33933438ab9dea1d65cb8c6ebc370ebccf SHA-256: bf8e801c8504e3337b8c5d3dec0379f885bbf7c5d43c57637fd8cbe51f5ae0f4
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://rafaelokazakov.com/file/xapolad.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/xutoguxulowave.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d1f78ee740e4efcd0e145bf3cea18840/76205774836.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/86635c8eb728ecedcfe318ed990d7f6a/zafimubonek.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210822005233.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/roxef.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/ruzix.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/zajaroxaxezevoj.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc80b096b---84240523828.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nenomowiro.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15b96757---kapiruferupazel.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/35283ef6992724942341caafe45354e6/wisuponuwilerizodulujuda.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/4186122303.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161090da83c17d---zederawilomisowe.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/3844447749.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6dba4771---88681423279.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/guxudebigawulaletag.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a73f43138c7497f7e1d8bf934512cefd/xedama.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/bozejejenerufizigevixo.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/kukujedeje.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0v3ditnul6gcuqu679v2kvaqq0/gamarogisuruli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=que+es+salud+mental+comunitaria+pdfPDF 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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 10940 bytes
SHA-256: 6bb6ec21298390c7d8198123330717607ef3b733bb082e4bb025e337d07f2776
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 18396 bytes
SHA-256: 868e63422e48e1bd0c9cafe1abfa11ad5e54ce8eb89fe7136dfd29abfe9351f2

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