Malicious PDF — malware analysis report

Static analysis result for SHA-256 908f3ab4a18a50c3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-11 03:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c628697e76d6ae66d4fd7b6f538f802 SHA-1: 4c6afcb1518cefa75cb3f4f0ce0a27df63509549 SHA-256: 908f3ab4a18a50c3dd389be315a48ed2943308be3e18aafdfe16096877d59c6a
116 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 WordPress sites hosting other PDF files. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external links on disposable or compromised hosting supports a malicious intent to redirect users to further harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=qr+scanner+for+pc+download PDF link annotation
    • https://rdsdealers.com/ckfinder/userfiles/files/noxelaxutotaloseber.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/papumiketoxoxerawiwesofo.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0uliop95699d7k9lhvhmbckhq0/zifofegelorakurabaj.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nefafemebimovove.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/92840749468.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xugepesafuxepusano.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/95126187943.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/soxofenivifite.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/puwut.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35d87e54b---xixojogitipilanadedep.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/16703418803.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/65485570505.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/damel.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/gimajezewuxemodefesinuv.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f6a05e862f6417a95c62b5209a82c54f/36495236533.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/83713282441.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210910120400.pdfIn PDF document text
    • https://flyags.com/editorResources/file///sonejume.pdfIn PDF document text
    • https://mlspoland.co/files/file/8025290626.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/62780082173.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/vumabegoxidisikorijigi.pdfIn PDF document text
    • 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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 17604 bytes
SHA-256: 97320a1b9180d3e0ad8e0deaad7679074f7e8b71a7fe15f4cdf10799a74faa41
font_02_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 10568 bytes
SHA-256: 47702262a031782593240a13c84db4e99a9daad8995497577a9319b3e67ee4c6