Malicious PDF — malware analysis report

Static analysis result for SHA-256 0686f7070c07bdb0…

MALICIOUS

PDF

89.8 KB Created: 2021-10-02 19:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e74fe19114b22510b6ff57d18e31df7d SHA-1: 623d445f7944fdbb5044a01445238666f44e60b1 SHA-256: 0686f7070c07bdb084e793b866a6d2b699772889876f71fc25c9730b8bf1faed
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 distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=yugioh+legacy+of+the+duelist+shop+guide PDF link annotation
    • http://www.dawnrotaryclub.tw/UserFiles/files/12650197796.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/lipizituxusite.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/2166868024.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/wuwejuxatorakexeti.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/83664075701.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092814571186.pdfIn PDF document text
    • http://gnox.vn/upload/files/47869731867.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090820174770554.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615884f045ca7---49466394553.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109132103366620.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/mulel.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/jezukif.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/86106848201.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d50a54b91---sowisilewesinubowapoxu.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/lixabipizu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/2812713146147d95d6e71f.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/57707369277.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zefin.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/63816170762.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/pologobaz.pdfIn PDF document text
    • https://emmaushuis.org/pages/66601169457.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/garoma.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210910221154483.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0dfd4e43---gedufitasisax.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 10892 bytes
SHA-256: c160cdb1e3ad16b082504e8f624c7b85b67ac6d75c3c941197e942691c2ca7e5
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 21732 bytes
SHA-256: 2446738c6525d521b0ff510126c2fb0cea423a7315d6e0250519371798260a7d
font_02_sfnt_off0001411b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1