Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acd98e6c2063f56…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 05:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f381f5cbcbf1ae05e5a9810682224da1 SHA-1: 7dc2c9d578409acee1e6b26823812ed450f95429 SHA-256: 6acd98e6c2063f5642a4f54c4e376668abdaa82454d28e343d88df51fca81e54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous links to external websites, many of which appear to be compromised CMS upload directories. One high-severity heuristic indicates a link to an algorithmically-generated URL, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gh1hthlue2jo7lv6kmk9lnn874/57997732411.pdf In PDF document text
    • http://pcwenhua.com/uploadimg/file/16242896252027315986.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9856549af0---90846264375.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09bc0ae3afc72e501ba2fd675fea79a2/83353071929.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/kovezazosumawozowogafitig.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/degosapavafobefurifowexi.pdfIn PDF document text
    • http://12shio5.com/contents//files/febawofep.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/robilalapabewuwuxe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081727c25de7---nanojutimiwagidugoweb.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/lisadup.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210728_784ADEB4534D17D7.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e05c1b73630---dilesek.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/96611171580.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/67691198346.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/xoxenezaze.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/zeferibasimejufapi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5kc6utl6hm1j35n202knr5htpk/86721063574.pdfIn PDF document text
    • http://go-forum.cn/upload/files/44242983384.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/1477550933.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/zevod.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/55158574705.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/ruditamenupobux.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/4097322802.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4ade3597e7804b40d68b46935b0f6cf4/63067697690.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/28691358907.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/sibigugepurudovozigamakom.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952890e7ae9---11468060233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=shrink+pdf+without+acrobatPDF 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_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16992 bytes
SHA-256: ab5583cb77095cb0b926ff05617181507dd7860476a4ee6cf2f75d4c3f46dd6c
font_01_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 10864 bytes
SHA-256: 44ded783500e8431f44f2b7fcf2f709ef3eee84f12dd5440f438ad400742e652

Open this report in the interactive analyzer, or submit your own file for analysis.