Malicious PDF — malware analysis report

Static analysis result for SHA-256 30bcc529a06753d1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6b9d5cb77440a208d1c1d1bf73bbc65 SHA-1: 94fadd7492dd61093b825467bd245011cc0dbcca SHA-256: 30bcc529a06753d124d09017a52a4c21ee19e395d20119d44c89980e3a175846
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://laborke.ru/uplcv?utm_term=friv+late+night+games PDF link annotation
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/23657243221.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/30881828203.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdc324c82---pisawi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f252d3fb45---45696520747.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/14487456243.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/39658485026.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/dumafikutudu.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/nilebesawubuvix.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/68554016228.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/ravakuluwewetatix.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57512771470.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/15410970157.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/legetijurodolavizof.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/68516851445.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/firekosufozusudojagu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5150338437.pdfIn PDF document text
    • https://keongracun.org/contents/files/69557771203.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/lasogitizagolagebufiwigef.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/45169710971.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/88425548563.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/runuruxozezokuge.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/19334366974.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/jopavexa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363398148c9---labasifutuzo.pdfIn PDF document text
    • https://12tiga.com/contents/files/bubedagasomusoxo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 10476 bytes
SHA-256: fc49fdc72536eba268e9c5cf320acf962725cb75c7611460d4c49329ed83995f
font_01_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16252 bytes
SHA-256: 54f983e0aa874ae1ec98c02a4e050bb20111b8a63b7e111365a67ef0d8e2ff97
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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