Malicious PDF — malware analysis report

Static analysis result for SHA-256 8423daa1a209c65c…

MALICIOUS

PDF

74.5 KB Created: 2021-06-28 23:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6ec7f4620676e7941fbeae260ae71a45 SHA-1: ff036873ff2875cf66108d4a77a73893654af887 SHA-256: 8423daa1a209c65c0c40d5c9d62f881b542ca8faf4205d8809d52f4bfa6595e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS upload storage, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da122aecb---texawosowimijemuxajumu.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5a0b5bd5a87371475960ae4961e931fb/87714509396.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/99898395422.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/59372204b6704d3394ef16e8cbc5538d/40846477922.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/dipalajopefifowofojewonu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa66d303b---12146533755.pdfIn PDF document text
    • https://patc.fr/imagesfile/matikosupabotad.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/6819119512.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608acab719f11---47572535498.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/50799726746.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081461b30473---wanawiraj.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ccb53cca2---nuliteveji.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30121478962.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8c33b994cdc328632b5b065c234a5738/kosemefuvutoxikegoju.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/38160239743.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e465d04054---44221943167.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nukaxikifebenuvupakisor.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc073409001---56137892387.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e06db79fab8e95b6dac3ca87d1c9177a/gupenosefowitotosibabiv.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3db80c5b---pedupetiwozimanaxizal.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b6c48febcf3f692644c2069e1ef0ffce/40001333728.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210620_11D4288F0223BC94.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/69551294871.pdfIn PDF document text
    • https://rajaunited.com/contents//files/60113725685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ch3cho+to+ch3coohPDF 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_off0000c322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 9728 bytes
SHA-256: bfe54fceaab533c8671d6fa4d7e488018cbb54121ad69fa35fbb7c53e4a9b7f6
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16848 bytes
SHA-256: 0574a43664ad8dd022f6e165f5a9b9a4f70d652b2e6fc65b294da7ee3868829a