Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fc14f65282a526…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 00:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0984abb364f5f08ccae33d72d5433ea5 SHA-1: bc6501549877f5adb856b031aa697338558f4a23 SHA-256: 69fc14f65282a5262f5e91d72aa8c9b3a408ad42f8c82ac0331ab2636a204242
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many with UTM parameters, further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://portaldeaquidauana.com.br/ckfinder/userfiles/files/24953819752.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6fe2a0d074b3e8c585c5452089b44df0/foniweludanejukibugi.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/bobamiribodu.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/3352941466.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31813164848.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/27610810531.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3342f61aaaf37b5baea9d2172db1423a/juvewijojape.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/vuginomarulaxapefilos.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/80184429690.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2227f318a2119837db4422981eb29aef/33536170829.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/40270420567.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1065472914.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e8147b49---71997842932.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/35297276359.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xunewizijopelivasewiju.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64073592844.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a0de2cf7---xadarazomoboxipejibawi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/73586242021.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zatojujolubifugi.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/busakulevarugiwo.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rojafakivowelekuruwagiz.pdfIn PDF document text
    • http://gibisch.info/files/files/4922648228.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4635ee666b---rilekokopad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=fluke+725+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98a6868fc61d226dd696b891bb520b95/17145434856.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 10120 bytes
SHA-256: 030f0eb355f7a6a0cbcec5de72076ef7c8c140a082309cdabf5932e3d5ba8f64
font_01_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 22144 bytes
SHA-256: 193985344d60abe0cc49c414bf4c99d3b88f5278f5f335fad2567d335540e2e4
font_03_sfnt_off00014b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5C 16448 bytes
SHA-256: bae35e80a99b072ae8a620a7892e8d492ffcd1c4c6e6aca2fa0eee87f389f48e

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