Malicious PDF — malware analysis report

Static analysis result for SHA-256 378211e6b89c7a00…

MALICIOUS

PDF

87.1 KB Created: 2021-07-28 09:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4cd2c8adf6783566a237f3af2f97e39c SHA-1: e66d5673aaf3fec87bfb992234e44c74c96a058d SHA-256: 378211e6b89c7a001dc64b293caf4d492ea88e433bfc08a2a4bab502cbb3993f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://webinaris.biz/ckfinder/userfiles/publics/files/vizaj.pdf In PDF document text
    • https://protrialse.eu/files/files/87314033314.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/15093478727.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ve8h32de9p2s9abcit5i1n9ss3/31344127016.pdfIn PDF document text
    • http://myqself.com/upload/files/4864120837.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc640927f090da219176310693c36f1a/pazuwuwumenejodimexex.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/kumapesovujefisi.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/10364650438.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c7thg6e6bskb3kl4refftehknm/sugapikezopijanekorali.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/78084045830.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/65958599374.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc2806393e---97012789440.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4c696e02ff377ff5220cd53d3b0c64e/mikovowuwukofevo.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/2167723851.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6aa84481---sejuribadurume.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/sijovebazazurefevugali.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/372f68f5b3cc3e98776c48592a10a37e/potimenepoveluxoduwudin.pdfIn PDF document text
    • https://yuss.it/file/33407536779.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858463e32d1---kubukeropaxa.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/68a1ba1a248c9394ef1bbf02e8da1663/mozutopuvupezimabizo.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/70177072075.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a75f73b0d970fe0bc776a551f6b0d42f/62635693723.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210531080013698.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d830bfb7e26953811a8d095fa508101b/duguvexek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=logo+do+barcelona+png+para+dream+league+soccer+2019PDF 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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 11324 bytes
SHA-256: e29368cd36c342b8085c050c42ac081ee1d4e2e5bfcec0525e0f78a8243325a0
font_01_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 17504 bytes
SHA-256: 768fb3d23e1b550bab4daf7b89bc8fc87f15c694bf5ddb4680e4f024429b3fb5