Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8008978878e27b2…

MALICIOUS

PDF

96.2 KB Created: 2021-07-06 20:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 883604c5e404b5c7981da36d73f83428 SHA-1: c41857040c1d5c0043c61a93b05698dec8313727 SHA-256: a8008978878e27b28732d23785154f291749d77edcb9f8d4af20363d777a5854
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to lead users to potentially harmful content or facilitate SEO spam. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 5

  • 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://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/62210248730.pdf In PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e89f8f1b558d23d8c79c8b8090a0b596/sasebizewu.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ed12d2c70c5dba096c470daa9b67c65a/savixekipatal.pdfIn PDF document text
    • https://hirurgija.me//files/jisekizemiferowe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ad386fc29---96993525026.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/5066767822.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e10acca7c---lepabarijeg.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/93862737140.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9d756b95---zekiripuzeraluge.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/53035e4d9e3ae930e5960c77715e3c39/tunerokobaxoxexafubatew.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b0db9488---lefikegimodukopuzosuzatum.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1830422eb---powizofono.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/78fij0s6hchhviqicn3odfr1p2/68127130768.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba19905626---78948875011.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/27121356712.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/pabeloxo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/jimisotavisuriwef.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/55035018583.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xenuxojugovubug.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845ac50dcaa---kixuwik.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a781b723b25---xovulex.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/97474373454.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/55843356199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=words+containing+guPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10460 bytes
SHA-256: 0f1b4b73f68a2c198bea26fb2f3d7c31706bc22732575646322fb755d5a037c5
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 1996 bytes
SHA-256: b896e9b10e2c4bcd1539dca56abe16576c0bd43b66e028e2d8f5fe0c8f43dcf7
font_02_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 20068 bytes
SHA-256: cd0397e3fa7d28f86d6cf9c52579f40a6bf22508f4cb4f29db7ee1674713f53a
font_03_sfnt_off000159af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1