Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0547abc8b016af…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28f472930982173ddd84761558516888 SHA-1: 51260fb3f45a2cb1cd216d91badad8eca949b936 SHA-256: 6a0547abc8b016afcb824e3b8cbb7db811376de65ed6c78560a541287ace7731
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The primary function appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://world-green-hope.com/uploads/files/54681719730.pdf In PDF document text
    • http://smirna.pl/files/file/waxejamixegiseze.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/ralelevutobuf.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/76655325448.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/57251305253.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f399261599---72479540328.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/41633885761.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ripozela.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/kixopozazugiwig.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-13/20210913010808639152.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/78hte8uhto0tinv49erhe8p5ki/46106964126.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae6d0eb0f---nolabowu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nidodi.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/movasuxijavenivek.pdfIn PDF document text
    • http://minerva-collection.net/files/files/94479108393.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333149ff07---lixafumagizejumovalutufe.pdfIn PDF document text
    • http://findacommodity.com/upload/file/88240680776.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/satikefezizuzomuvasu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/ladapisofejajut.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/losagazupuwi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f64c8842---likevekenuf.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613487d37e671---8611707986.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kalujixut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mod+pixelmon+for+mcpe+downloadPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10696 bytes
SHA-256: e019463970939b06287fea3431d59793ff084eb7587812264faeb5d50eb21518
font_01_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 19152 bytes
SHA-256: 5c8919a960d031dc7e13159439712eff31b5ceaff5df5e6d079c7ec4796277e5
font_02_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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