Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e138fa8de3f56a8…

MALICIOUS

PDF

85.8 KB Created: 2021-07-18 09:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b85269de4b1a83a7a754a2f5d03dc434 SHA-1: 8d014ceb22f0239280df836d5cfb6cbea3d381fb SHA-256: 5e138fa8de3f56a8af58cb16c830dad27f13d2869ab2f9f50518cfa587b80288
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it functions as a link farm to redirect users to malicious content. The PDF itself does not contain readable text, but the heuristics strongly suggest its purpose is to facilitate access to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/eb487b5e314321dcc484bb3e0bcd8395/7373726587.pdf In PDF document text
    • http://tiwtactic.com/userfiles/files/23442655935.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070709540173499.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da4a730e2b4---dorunewowavutanukelekov.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/mh83cf3lasb46pluff2bksc1lo/30827708377.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160805e9d3adca---38029952063.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8kt1u0gltmcae1989g29ahbjhs/surusuzibut.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3714d5d52---60834391627.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b92ba26c4e49f66aa92d376d1d12ff3b/69228557204.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2bc1d29b---26654633732.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/dorigibijaxawabufenor.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1202824cd6---finetoborisajitagiso.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107062247393727.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/eb1ccf64c5f5e3ccc68cbd5ec2091acd/36583376056.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/nolokibabitelikevinovevop.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/miwubekofozozabenejuzor.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/eac1cf85d43742c1cceb1573803f17c8/2756001277.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0b312e65e---molenilodovetubi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9ce23e3c---gegitogazip.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/rikuvodilibuko.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b65965aad42---dosunata.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/20454203798.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/52f0b0ebf81317345f3a1216c113c60f/93898711642.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070a98c351d1---54411921985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=a+polygon+with+4+sides+and+4+anglesPDF 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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 17660 bytes
SHA-256: 4e662ad7c274e8689b31278f1bb7e24a9be638cf1d09fc30bec845fb3bc41810
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 10832 bytes
SHA-256: 2d332ca17149494f6ab8d1d846820550b3f3cb2b93651c7f263bbb0607999191

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