Malicious PDF — malware analysis report

Static analysis result for SHA-256 43015222c7566b6f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 10:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e39435f9cec683cae4090b492437c545 SHA-1: 59d69da56b3d066f411487edcf59ec698bdb06f3 SHA-256: 43015222c7566b6f0cfc0174834a690e4b1ed8724aff9f46bdca331d3a6e3a78
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests the document's primary purpose is to facilitate initial access via spearphishing, leading users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://suamayin.biz/userfiles/file/nixawopofibop.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b4128291---75456235013.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/19992589629.pdf
    • https://whitesal.com/data/images/file/8691_20210522094930.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0cc7069c96fb6ee7fa170812d4fa9474/sokefo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa2dfa2840c---leligefifusudogupad.pdf
    • http://balogmihaly.hu/UserFiles/file/tamajutobusuz.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f16aaf582d90b1b0fee1d0f6bb6295f2/64593207940.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/160b51cfb94b037d51a13da78538c4f4/xigujesatefafokezejelup.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b344a207f6c6624e7fcdf7af01d6eff0/3081092136.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ceabo3uu23d2aqs09lk18gq4jq/69471246984.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wufewonasuxifanidol.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/77261092586.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/79793993870.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608940fa56fff---noxamir.pdf
    • https://feng-shuiworld.com/userfiles/file/fuxopuvutazemifewevu.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073db26d985d---zijiwumigitotonapeduxe.pdf
    • http://vector-luczak.pl/new/fck_user_files/file/suluw.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5f27d49712fa1f3eac9abe717e7f26ac/32927069753.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/94a3e5b12f00b5a7439afa2a40f46380/rixerifoxapuserajunakelo.pdf
    • http://kashima.cc/userfiles/file/90188008742.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070afb46d03b---muxupevo.pdf
    • https://giolog.biz/images/bulk_images/files/befopisuzabofuzuvitupiko.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f25395ac---raladonukaziwitexukof.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717c6fb7b97---wekusepesuzefokebi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=supporting+language+development+in+the+early+years
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 16792 bytes
font_01_sfnt_off0001036f.bin
8f1fec55dc11cc5be1af3d6e1878d278a84553d9076f7b61460b6e99e1727ebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16484 bytes
font_02_sfnt_off00012ddb.bin
d55a7a0ff9b275a4f924b0ee37c5fa17a35772fd93528e5e90e67aadc99fa667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDB 11196 bytes

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