Malicious PDF — malware analysis report

Static analysis result for SHA-256 88732326256946c3…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 20:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 687e7e3e045deceebe7e778c51601aae SHA-1: f8fcf70e829abd8609d14f3779db1ee5be035c66 SHA-256: 88732326256946c3e960fd8d52d7c991f1b52da7eae007138568dec12956b2c6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://www.pes.edu.mn/ckfinder/userfiles/files/98566542944.pdf In PDF document text
    • http://slstudio.it/userfiles/files/66190757748.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/4224680737.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wiwinoxosijen.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa7a07ad1---11082308587.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/zipuluzurezalakojil.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/93608896566.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c3f09188---daborodetu.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/batapi.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/53258762962.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/80291717204.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/72002226441.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/kakafu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040348065909.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/zinixojukojukujogej.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/supakowimag.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kezenepakojavitekolevuru.pdfIn PDF document text
    • https://cargobull.cz/res/file/vajokobigegenuvogo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nivopoba.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/44182726174.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/82388572285.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410ce4955f6---95057091262.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/seselojizi.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/nejovaluzudogakusavo.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/nisawibufeworalobifebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=battlefield+1+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 10284 bytes
SHA-256: 46737742ac6df2dbc8ac102fda7d5006586971bbf234d2a3cece61dd98a7e9ff
font_01_sfnt_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 22536 bytes
SHA-256: 56a309b594748dbfab8b3a7b2ca8106a7381470c2cdb692f4c950ef728778a42
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_04_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5