Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d4705edf75da20…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 22:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae2a84ab2d8f143f8fefd7565cf80f2e SHA-1: 42c7c2bbe769f22bf6e9a299aacc075bd5639e35 SHA-256: c9d4705edf75da204fc1930dec5dfeb8e210e574fb12e601b8befb5fc7955e7e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. The primary purpose appears to be directing users to malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://officialbacknumber.org/editor_up/gonifotamitodipi.pdf In PDF document text
    • https://damiel.eu/userfiles/file/62086268918.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/rusewesorewexo.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161385fa5b3b72---83551298883.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/disefivuvudolujinavizaj.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/of2gnist9qcvsk5vc7h1skaau0/30056189479.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/5573421491.pdfIn PDF document text
    • http://telektrans.hu/editor_up/10236856877.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/26660661003.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/novovosilodot.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/noboxozujugu.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-6/20210906060839304119.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/libesulegorepifuzidejejak.pdfIn PDF document text
    • http://upakuika.com/img/file/93294203303.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/56912413624.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/37393903738.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/82597639335.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/41039179370.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/wosepebuvekibaguw.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613767eb30ce4---28741766009.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/73166882782.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d4c93ce6---23657635102.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/18421615521.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/vakilil.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/pixokujowavitimekarapak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+games+ios+2020PDF 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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 14996 bytes
SHA-256: 79b42808146c8d84bc0c908213cfe2aa933496503b198fc0324f15c1b01b17a1
font_02_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 10700 bytes
SHA-256: 6f86197f4f1ccf5b585fdcbe3358df8c953bad9c9537b0efc23fbc04fcb17b65

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