Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc43e3681e0a719…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 01:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b07566d63baa57b1cf75e94179a4fec SHA-1: a0e431f769e054cf9387e990034f1dc4b60bbb1c SHA-256: 9cc43e3681e0a71979c4320f1d5a1b81f782d66401e17100796a744709b79744
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links pointing to potentially compromised websites. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide clickable elements. While no scripts were directly extracted, the presence of numerous embedded URLs, many hosted on what appear to be compromised CMS uploads, suggests a phishing or malware distribution attempt. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/af021740a0745870f3601a64a183bc68/gonefebujikasiramiz.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451430134b---bamatofivaf.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/judibo.pdfIn PDF document text
    • http://wohingltd.com/userfiles/8012307183.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/gomuforodekinilevenuwaw.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/deliwu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef7b65fc---83703074787.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8c76fd4fb73ecc2f14b5be3337584b47/99844971440.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f95b4b059---wikojovuforotuzumowero.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/tovoduvilonopukuk.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/foraxor.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/g12k945gjqln0bv7gdrkos4m5v/gomujajivizuzosudu.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/30511631796.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/pexixab.pdfIn PDF document text
    • http://ore-processing.ru/d/files/josanituxofo.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824725c2d34---86588407172.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6cf1330e49440934cf753bb58b9cd647/68914899414.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/woxasufikedezatet.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/zunadanuzaxevelixoleba.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607129a5637fb---dibip.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/30573826127.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/99d5mui0udvf564iatmpuqfc17/danil.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/zilidexuzazabow.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c9015839---61463114497.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/30611025082.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d23c701c30---wapenozizugikiwaxakebol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=diferencia+entre+proteina+vegetal+y+animal+pdfPDF link annotation
    • 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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 14228 bytes
SHA-256: 1ce450a133f1c2e3cb979841a9c779eef8aa074589d422e75e003a0ab67ae0a2
font_02_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 10976 bytes
SHA-256: 4f09ec4f2961b4f2a6378041e0d1226908b3fd8118470191aa91c982d8a8d5b3

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