Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0916fd030bb68d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 09:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b8264d935eb961ee6fc23f55b8fecba SHA-1: 1f3302ec2ce4bcb0dd8b20beb1f37a9f0108ee10 SHA-256: fc0916fd030bb68d5022f9d87fd59cf8f795ec448ab75e852b82dd1698aa3540
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=how+to+check+that+my+phone+is+rooted+or+not PDF link annotation
    • https://lesartsdansmonjardin.com/userfiles/file/20210913171645.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d056614---punefuwifilugifisated.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/rvarhjiesp4cdte0krk94qbflpa8stvm/titaf.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/korodo.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/88093217625.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/23739803956.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/74905832585.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/26005869950.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/tiluto.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/xufubejapogivopikenej.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903035658.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87cf41ab5---vawanokekesowesajovi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pufikujitolezebameduxeju.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0e053856966c31a3ae3284db7538ed24/24871940367.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/lomojevanenanove.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/73231682722.pdfIn PDF document text
    • https://robertbah.si/files/file/30570824661.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/31726803307.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/donebulerovizomotonoko.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/56998790569.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/nedujukewolejut.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/govuraxomoxotanepijerupar.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/12816593821.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/30120019325.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 17832 bytes
SHA-256: faab79b23989c977ff4a9ccbac6ea756941fb1f818b45ed139467d4637847dc1
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 11016 bytes
SHA-256: 5e6f5d0d29ce27ad644fa9edb37e15f1d1266c8c7a1f49df940d4d53c17a881c

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