Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db38ca0d57ca11f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 21:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9b29cd9ddccc3c9115bad1e353b6a80 SHA-1: 277cb919e9930457f794f3f30db872b3e5a57401 SHA-256: 0db38ca0d57ca11f9518355d1aaf699d51ffc05b0ebf52596343580a3e4ce8db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=1v1+lol+unblocked+games+66 PDF link annotation
    • http://oldmotorsclub.com/files/file/rigebemesavowaxufeniv.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/keloxerubuzuvokigus.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/30581285813.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/vesabizigodugevukoxixevum.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/22196625864.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613308a36910c---vugeka.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/34891563187.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/zapevidukun.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/bozudasumilegomorakupofu.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/pekavuzivikafim.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2578cdbf4604972ddb80c6b25291c369/wexadezoronopelibiv.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/lurelusizoxuzobur.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/19010802938.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/wewudo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8a4e1a33.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161337fc331a31---patow.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/nodusutelubumorafaku.pdfIn PDF document text
    • http://chinazzjx.com/d/files/31383720604.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/5051769032.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/motijanezetozuxi.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/kuvipap.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e77f3f47---mabepolovuzi.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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 10944 bytes
SHA-256: 9c6adc41a5ddf0c27a4d8e3669942697007f10e2dfdbe8fd1265e4186f472e9d
font_01_sfnt_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 18536 bytes
SHA-256: 283dc8c4018b66f9ba202c7837c2136997cce48087f6821b79978b790ebdfab7
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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