Malicious PDF — malware analysis report

Static analysis result for SHA-256 af84b4d27b2428c9…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 19:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e5e32d05d911c9087f3a53ed18993651 SHA-1: 8529e0383726ef94b98e958c2cfef0642bcb8ea1 SHA-256: af84b4d27b2428c9dc79f20430c5fc91e855fc7cf4948bc7065549496a3f3fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the link farm and the detection indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://csodamalom.hu/files/files/vixiwezeserib.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0ee8b26b---pitetodugagekug.pdfIn PDF document text
    • https://eetravel.net/file/jokaxewenefidulowusi.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/45049232815.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/lebuzolugegosuzobizuveju.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/dofanabafumususareme.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375eb384c01---86989690483.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/giwiduzuzakekeduwixetuja.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/nezuriresefes.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/90170255879.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/1771451191.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/28902581609.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/wosasejaxovojov.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/98294994705.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ee994643dd08dcb90b50068df9adf66c/zifevazut.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/powot.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/66979779202.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/52449206667.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/rutize.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/99242061249.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tepodisexutilefujizidobe.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mozanijikasesinogo.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/45267488788.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/linufategoso.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/t25abcric9j017o5628h7irpg0/japinexezosijezekubodetop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hill+climbing+game+apkPDF 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_off0000ccd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD0 17432 bytes
SHA-256: 9b15a0c024c5836612dc1af8dde7239de93917cea982688f11d8abf06b4f00d5
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 10456 bytes
SHA-256: 57ee21d27f0e229acf0ac18d66c8c247c905d85b38645e3b40da4dae3a0a4309
font_02_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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