Malicious PDF — malware analysis report

Static analysis result for SHA-256 b046b2739fee4c47…

MALICIOUS

PDF

87.4 KB Created: 2021-08-12 20:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 3669ece749643fd369fcb25d15cf9cdb SHA-1: 6145b21cc32af2fcf8cccab015acc263efafcf00 SHA-256: b046b2739fee4c47b35592336da8453b599baac520870ce291eb7a68fe810693
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a58cf3fd1---35718922943.pdf In PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/5ef402266042fd2cff9116cf6eab78c2/godexozejamazi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160859498cff9e---82776656032.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/5880506735.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/dulevaw.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/dipepoturaxokufudofeg.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913636db011---79016623255.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8c409f89bed240987de95180915685c/22773420378.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0bc87472cc020a42ca274c71cf2b75d7/80557532849.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/wasiselexesade.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/46772075539.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/tarekiwefejimap.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24d5f390c5---64963694459.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/xulezafopuborig.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a69c248021436cc28f57ad7e7e083f8/sunujamemokiligudil.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/dljd862hvvk5hmsog0fp1dboe2/dewoxom.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f832305---6240642972.pdfIn PDF document text
    • http://clingac.com/d/files/63304589083.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25bf60bdfc---turadotubojibakosilul.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/56436806515.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/sinaxusuwivifino.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/bapelelidefafan.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2275cb34---dasisalirunilitefarewar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tintin+comics+pdf+free+download+in+bengaliPDF 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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 17656 bytes
SHA-256: 027b1695d8b8ae5d7e9f1ddd7471f36b1f247176bad4f127dd1a07325ebc0a60
font_01_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 11152 bytes
SHA-256: 84d00ca84168e252d6fe581ac8b4993a1005c495074c8b93bbc6673f19880e1d