Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9410c10e82d6c7…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 06:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17f0d960b9243ca644b0052095bd5dad SHA-1: 6f46b7b654e5dfe9d19a50ada1b0ee26141b8bde SHA-256: 7c9410c10e82d6c7d84bb3f8d4f029a137292189bf70a5d860cd91455c9b636c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3cca932cb09b6b18fb3489db9511b585/69626644557.pdf In PDF document text
    • https://efnnma.org/files/file/71157560830.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/694226192.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/347fe5215564b20953049e91bea5dca3/38973883027.pdfIn PDF document text
    • https://rintrans.com/files/79449314118.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdece461acc---xiremuwigawofixo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zumavof.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/fivopiwuki.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/maxojexubivabamakajaw.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097463ca578f---86930067232.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f8bf4ee63d35547409905358d58de7a8/bibuzamuxakutuzopixeniji.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/tonexokavudaxezumanupidi.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/50552939436.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ubb2l5uasten3ou63s67fh6ip8/xugusojurudubetuduxaxe.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/c06b32d4bb142966740399b1e93599b3/44512571732.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/92957571744.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/60762454499.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/ledonipamipudotigazugug.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8abd889c1---xewusafeduvunuxuv.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070695817d91---kozefazikumekavokekalux.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/34378274616.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbaadbd15---nenurosazixuk.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/63563576061.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/85882973712.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931c7ac4ce5---jovuzafetoxupamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=daily+herald+crossword+puzzle+answersPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 18028 bytes
SHA-256: ec65beafc1780ee88eea01cb468c12b9f4cf376ac5ce01b53990fae608c1c152
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 10872 bytes
SHA-256: ff7905c5df48f689c44b9e6da2eb7bbb6b834c8002b771ab06d7614350ec4346
font_02_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1