Malicious PDF — malware analysis report

Static analysis result for SHA-256 9379ebefed665b82…

MALICIOUS

PDF

77.1 KB Created: 2021-09-17 17:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28ad06d2bdfc2b0f65cc2dd6467b92f3 SHA-1: 16329b29e29e26b706b5f28df4b8e3734634de5f SHA-256: 9379ebefed665b82c02037d4d1cdb17fddca364cd6a5fee4c7981e52e833d494
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic to bypass security measures and facilitate the download of a second-stage payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://laborke.ru/uplcv?utm_term=ad+blocker+chrome+windows+10 PDF link annotation
    • http://mingmitrcoffee.com/user_img/files/javetupigobibaburizig.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • http://vejwun.cz/images/27893928661.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/badibimezobeboparomeniwu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/56ba18185b98a32c3a8e0f7538178ad8/zizotozeduv.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8l5e5bhe3ihopsa4spajlm85j5/tibuvuniga.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vinenifosedifojijako.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b1525ce44426a0b8eacb5457be0f5947/22606497012.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/50530194810.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/99086245775.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/junomupaka.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/rawazukogorinutela.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/14391341046131f95e7c369.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412e2b96a7c---pixew.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/nopovasejosudu.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/8602669140.pdfIn PDF document text
    • http://simonide.org/userfiles/file/19444004865.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/15738149387.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/bimuveduvonikiragotirigu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe0dd9b52---bijuvakuvepeg.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sunekifakibiduga.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/zefisefafenavafefoje.pdfIn PDF document text
    • http://chayka-svg.ru/files/62651412907.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa5077b103---59652630914.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/nugutixovepenori.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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 10848 bytes
SHA-256: 5d317c97a5f729f81bcc5a3b941b5212a13c4507968a6878ae8162c31edac13e
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 17012 bytes
SHA-256: 877aca5d277d4e3582cdf46d8132ad3687a8ba496882854c96a9a853a4bdad7e
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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