Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a70a1117e73c2f5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 07:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1676716c22943a9ed43d31a2c2c663cd SHA-1: eb0030b2804031c1c379c52f60b5fbd2f7c5912b SHA-256: 8a70a1117e73c2f51d68883b78f0781616dfebe85bc0ca3030ec52e89ec42d45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ahreco.com/uploads/news_file/53257430567.pdf In PDF document text
    • https://maturana.cl/upload/file/larixodiva.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612553b953c15---40425015271.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/30445755405.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/22482048044.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942adc60dd3---66490887041.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/bdtpvffloj7u5ka044o27ojhi4/95813879142.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/gaviwoxubajalinutito.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/71082663102.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ejqupvso7jgae1i1p2lt0fvpl2/jusutamubopenadixupaga.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e03a52eb53e44f1ab9b32761cdc3959c/9259247922.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/bovuxegajusobugazuzipumo.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/69121912195.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/49631343354.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbd275d546---xisesutexugixifo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ec683247b---25982325229.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6b317ddd61fd8dfb026f0eb7c4cbf6f5/rafize.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819183ae23c---69748256825.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9b39fc83---nekitusaxanixomefuru.pdfIn PDF document text
    • https://epiphanych.com/images/file/77999350520.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/62254571301.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a35137f1---forijisunixefofomidib.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c886bb5d6d3---22578590771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=multinomial+logit+model+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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 18820 bytes
SHA-256: f42b5d276747984785af83711a9a135e6b39154976d0fbb3fd314cbab860ef95
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 10668 bytes
SHA-256: b27b8b3130092987d7267560b045573faacb920d6008d379213e4febf5e50c0d
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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