Malicious PDF — malware analysis report

Static analysis result for SHA-256 f016e44632a8286f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50e2eda28b75aaaaae8cbc38d7d6d22e SHA-1: e4c45996ac05ca0e9a8d212b4f247247c26bbea8 SHA-256: f016e44632a8286f6c4fa4b2bda6a752d82b806abd6dd1ab5978f67cf2d35c24
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely for SEO manipulation to lure victims. The primary goal appears to be redirecting users to phishing or other malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=boeing+737+max+technical+specifications+pdf PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f56c9a3bbeeb3363c3c8d8beaba138fd/20745029735.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/zukovetewetaril.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/jarijutuposax.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/55899664122.pdfIn PDF document text
    • https://daismene.it/file/70655936432.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/darinugugiruduziki.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0g3ci87clv0pp4m9icpuv0mcc0/29447677357.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9b20d607f---38478872530.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b15f12742---27249531307.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/49093391316.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/18125875239.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ed9edf27eab572b11ec7e69f1268c602/41765563850.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/xawatixegetudisazidurumev.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/fapidiwij.pdfIn PDF document text
    • http://fabtur.ru/upload/files/8310061059.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/mrvs8djamc7dbajk4gco7h1hv7/lujuwigi.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/zubadozasitiramigu.pdfIn PDF document text
    • https://rintrans.com/files/9893491996.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/44100779522.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/jovavodadax.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/botekapekefoda.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/70733127923.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/827edd912b6516352a52c8d26a205796/fasoro.pdfIn PDF document text
    • https://tomas-music.com/contents//files/19421442065.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/vudobovuworosevipon.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_off0000d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A4 11344 bytes
SHA-256: 3e15e31b249d8243dcf9702e27b556f1344c7ccb045ff6eeab2fc63979fbc7f3
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 18236 bytes
SHA-256: c6c08f47dad3aeef9c4c1d39b5c7a3975e9d037470c2c94e9356af92dd7e1f37
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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