Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4587411de5f740…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 15:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6b1d5cced23cf2e7ccc6101c85dfdab SHA-1: a63b25693c138feb2eaf9df25c108be3ea779e38 SHA-256: 9e4587411de5f7400b7a5d76f842e263854c5ec16d6d254735d57bd69579300e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_RANDOM_URL_LINK heuristic indicates a link to a potentially malicious PDF file, and the ML classifier strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • 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://crewmak.ru/uplcv?utm_term=tualatin+heights+apartments PDF link annotation
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/78984409640.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81967561849.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/mamif.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/jonuramitujof.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e0e873e47---20104786172.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b50d6801e7c49945807397f3e8e04ea6/65426400719.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7bacbc62e6ffcca57b1785c5de43a752/zutokisobivosepebiwemofox.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wafavusen.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/aac6cc7a25d19e46bc41d93bacc02454/nofilogideleresib.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/zodamowetidujukilurogele.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/zarasutuja.pdfIn PDF document text
    • http://ore-processing.ru/d/files/11060957102.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706e93ebe48---xidusidorus.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086a1ca3e943---wikivipel.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba3a83576---fedoveroforeniwusilow.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/pufuvefuvilirinuxataku.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/vavekekozuxev.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160884803be5e9---jaliwejejewepuzakujiv.pdfIn PDF document text
    • http://zuche0551.com/upload/file/45928901152.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/indk66n4ucinnc786s0hk588tq/62943931874.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lofatosoke.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10644 bytes
SHA-256: 52470ed44aa260cccddf5a86912e7f8edb7ce1441b45d60208e4346fc8ef6b8f
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 17960 bytes
SHA-256: eaa53cf45aa003b0f1049a34d694d1dc19bdeddb4b946938178ad2caab082fe3

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