Malicious PDF — malware analysis report

Static analysis result for SHA-256 773a502d3285a7b5…

MALICIOUS

PDF

88.9 KB Created: 2021-07-08 00:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85aceabf442f38a2b2f42089cfe69c96 SHA-1: af66e0722758dcc9f203ddb0138f9258c4c11ca6 SHA-256: 773a502d3285a7b51e0316c06cfec09ff716d0be17745f698bab24ef1444fd77
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting, disguised as a technology book download. The presence of numerous unknown URLs hosted on potentially compromised sites suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3bc5d0f65---42830266821.pdf In PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d183dab2---4390336248.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/sojovadusibajuzuwimonubab.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/lifa6jc9vs6e0ok9corsg4dro5/pedexokisofejafovi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/98akitncifqtr5eqa60ls1d9og/44793917692.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/70759798428.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/55720531988.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/34903382097.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/92744136779.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b7ef15f5effd168f69150cecb91a3ab1/fulax.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98063606422.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/72126450603.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2f8b01bf---bijibetoso.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/55fbedac3a6d419cff859c173f26d13e/lutomimikopeji.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a893633b165---rederuxano.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/e5ec6928a24fd219b579f6e4e7f2a578/12307056135.pdfIn PDF document text
    • http://ccsl.asia/files/rodolu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096412edb85f---75741263669.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ce5a8eaa24161fb7802485c1f59c7f9d/mirefarapopojetizifudilut.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160790e4a74917---42290133364.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e909a9b3d0---32159301004.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/80342007367.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b73207850ac---gejozenefotuboduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=building+technology+book+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_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 17516 bytes
SHA-256: 1244d15ad583f0ddf649facb52aa6af645a5447b14c97d013b1b5245c00b91d1
font_02_sfnt_off00013da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA8 10968 bytes
SHA-256: 94635b88242180a97b04b693d5e7b12ec2ce02b5374693ab70fc754faba35b84

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