Malicious PDF — malware analysis report

Static analysis result for SHA-256 0011b32a7f4f410c…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 07:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: de56316e7d7228b43340a53869346961 SHA-1: 64855fb42435d71d12d389bbda9ea935e64155b8 SHA-256: 0011b32a7f4f410c5803ff7bcd85f73db466aae79c7dde6f94291b3cbf988259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to phishing or malware sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+schedule+a+meeting+with+outlook PDF link annotation
    • http://www.annaleehuber.com/content_files/file/80217370118.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8690b7955---xigesejetapoma.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c5652061dc7ebf8fbb7f7bbe8090cb83/4721355738.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4ace66d4---42996050265.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/18582791780.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/35632594437.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jukupuvupinagosizani.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/73442957020.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/32427319547.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff0d713ea---woxizurojoxux.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/23097085291.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/9gclk3a9s276o0kg2o080ndea6/ligunexelujatuw.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/90553476460.pdfIn PDF document text
    • https://dhesient.com/media/44190762274.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093b70793e65---fopuwavumawerofu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f804a90feb---sipizuvaju.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/83976123383.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/89217310915.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/616ed6236610be12ec613aba5fcb76fc/43770573422.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabda63b01---bawodaxiropisadirizo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6lgg6ru64dnid3dn8pmrpuicer/wulimimimitasiliwewevev.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f28ae566404d724732e248f3352241bc/dipab.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nivigudemarom.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/xomuzenuzufonelulonap.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ag7jmirqvpudn2sohr9ca6ep63/vorupugi.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_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10984 bytes
SHA-256: 00a553416ad9d4658e77e7fc2a1ba7cf07e791048538da8f2cc78ab5d0172a0b
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 16956 bytes
SHA-256: 65c6849d8efec785268a9d4ea160e25fbbb9a069c98b3ddb7b2fbc5379f67334