Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d2607b857f08de…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 04:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23774b56db77f8960f06b57881fd30b9 SHA-1: de585f530df2af3c7739abab8ff5b381c2f48bf5 SHA-256: b4d2607b857f08de1b1af65485d1377a63dc333b89ff97236fdca24a798689dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, including WordPress and Formcraft instances. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://autosvilar.com/uploads/ckfinder/files/jevopeg.pdf In PDF document text
    • https://mvpartners.be/images/uploadedimages/file/guwog.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078249635ceb---17061987896.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9f5b8a2df---49541877685.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8c3c70414cc82d0dc3fc39fcac9cbdde/tuxomol.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/kebekuwan.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/tibikiwewokotamopiluxisav.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f57a9ca0fa---1622323268.pdfIn PDF document text
    • https://777mto.info/contents//files/47369696940.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/3224116805.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50658e7ba---52631130653.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/6486177428.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nojiko.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/lekudixo.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/resoripixoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112f41b9d020---warazijejegidojudadif.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf797a3aa---30710101525.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6adcc6e69e0cb417275883b8d42e649b/29528229409.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/47af58b35e582701df54abfa922a261d/tekobewirikifajib.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32527574802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=an+introduction+to+dynamic+meteorology+5th+edition+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_off0000c51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 18960 bytes
SHA-256: 1550a23552f5805fc49a328ac233af130a22122b7553cb1ebe5cdc7bf421a5ac
font_02_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 11228 bytes
SHA-256: a21c2b96860ee38804a9a5bd17dd02411c2963739153353b0b2dfee95042602e