Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5d503fae5d6ee0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 04:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e228b33f5ddca2bab837815dbe9e062 SHA-1: d0376a04241cad89f6a1bb9208499a438e3921f0 SHA-256: 8e5d503fae5d6ee01bcd459b487530944e86f65db6a9c0dc13765f3e8dd254ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a tactic to host malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aspaeng.com/files/image/files/33243338932.pdf In PDF document text
    • http://hanasushi6.com/uploads/files/guxukujotabeweb.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/20260588528.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/ximoku.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/55883216652.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805958821bc---69089639446.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1628501854.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/lonugakoxovijolov.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/gajowixowu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/27622485458.pdfIn PDF document text
    • http://fruitvita.com/files/files/41157338816.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/11371500130.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/godomobi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092886443d07---59197965483.pdfIn PDF document text
    • http://langyupharm.com/upload/files/6314498373.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/37022783194.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1501c30ba6---rolinamezodapivomak.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/dimakututewatasekotipe.pdfIn PDF document text
    • https://etimes.mn/uploads/files/11189121531.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0408ab641---fadavisamuvozuliraboz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bb107a9dd---2624264011.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/reriwim.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3d6d62af7---51694998069.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/karalilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=materiales+de+construccion+madera+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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 10876 bytes
SHA-256: f7652866c901aa2557d4a0a33b706c29284a602dee670b8d9fe2061c63c44886
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18644 bytes
SHA-256: 0946d8a06bd84ecab0c998834d81fffe2cc09af98e33bf0a03f31259c9ea784b
font_02_sfnt_off00012bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1