Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4aa5ef1dcb0ad1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-04 23:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3af786273e9c92b73280750dd6668730 SHA-1: 2029e74824a97f710d5c972048ffe7f0923b4af4 SHA-256: 7e4aa5ef1dcb0ad1f10046ae02e5f4738e1a37061b5b88516dd2818458d58afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=incoterms+2019+pdf+english PDF link annotation
    • http://ettorebelfioreliutaio.it/userfiles/files/54941319815.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/34596779270.pdfIn PDF document text
    • http://myphamasia.net/upload/files/makuwebarevipaluwevimugeb.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/63024004739.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/44f21dc41d3f6244c0788c04a91333d8/9383856681.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611302859a6b1---62580911124.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/92824548824.pdfIn PDF document text
    • http://fteq.ru/files/file/25692856277.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/46264584899.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/smdqtqrff7f7hnmgvf3inp6h3u/xenepadigupul.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/df4ae2071eaa74e2fea27d13190bd40b/xadujotogeraku.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rce3ti4bfhp4j904pcb1v8edcu/kamuxezezoxagezugibiwogiv.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zenonofinusorosisaro.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/vekiduduzuwof.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/51375661352.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/43569283325.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f8473b907768e37a7f444fff2c642ffd/gedude.pdfIn PDF document text
    • http://cy2hand.com/userfiles/bawazazazogeripubowatoki.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/sogovebenusipiz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0f249eba2.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/datovanudufilok.pdfIn PDF document text
    • 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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 16980 bytes
SHA-256: 4a48cfc9ac1d4e2852217b784d5ba8fc0f3cffa1ec2df12c4d80c4792d8e5fc4
font_01_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 11320 bytes
SHA-256: 0e4262abf9b2f01812cb790da7f6fc3bf3dfcfa2c9dc49b045f11d62ee631553