Malicious PDF — malware analysis report

Static analysis result for SHA-256 146b2343018a466a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 07:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18daa2a9b806ba0804e8ebd6afba2282 SHA-1: 54646c54b5a9ab812011121fba1533040cf26493 SHA-256: 146b2343018a466a6eb833dc0cee1e61fb4f4bcc5ec30e1bf3b4b1efe4d0dd8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70123242318.pdf In PDF document text
    • https://energooptima.hu/upload/File/76862302345.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/mawavenaduzer.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c88478729a9---58099571082.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c329e5b128---62522977360.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xibuzosi.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/jeremakabunelikugam.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pogoreg.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lepazowisumevorenizuvajo.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210829_6D48969E065EC4A4.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/pelokoxuropebopizer.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0131e2ad37---kotefasosogobaxi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/20881629059.pdfIn PDF document text
    • http://hnspkjx.com/d/files/kixatemularomajotoka.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/70292549645.pdfIn PDF document text
    • http://snft.ro/media/file/gujidoxuwozalaviz.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/mamewuxepamoxoja.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/1002044471.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/12125825819.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ca7a4c6b200bf904eccc098fd55678d7/likevekisufu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pogumeboligitogud.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/vefufebaralo.pdfIn PDF document text
    • http://tayles.com/uploaded/toxez.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/rasikepoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=picture+graphs+first+grade+worksheetsPDF 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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 18040 bytes
SHA-256: e8fbcfc4fd7968ab223814ac464340f153aa5e1971473735434e452feb2ad2f0
font_02_sfnt_off00012e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E06 11028 bytes
SHA-256: dac616be2a6773a364a6f21951fc172ff44521bb3bf0153abfffc9d49c1ab401

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