Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a4b5b72f695086…

MALICIOUS

PDF

74.5 KB Created: 2021-06-27 22:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1f5913f68126d4459c795a1f65e30647 SHA-1: b5cbddbacca2d7e16a1a03a6c73d081c63c841d5 SHA-256: 19a4b5b72f6950865fc82e468ec1108732eecbb65a922672ccba1617a8bd994e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/os5k25aqoeam1uqbhfblu12b8l/vejusepasenaz.pdf In PDF document text
    • http://cnp-inc.com/ckupload/files/tifowa.pdfIn PDF document text
    • https://mszukam.pl/dat//file/83390705795.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/mopabozulebutukokixuw.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/39762060604.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a7a2d304c---tiwelimiwogubibu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091752af0d8c---74990720316.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/93255604253.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084abacc340b---wilomanuvugukowugupege.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9db6aff512a03a2718bcb272d59dc199/gutuwifawusek.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/31369980700.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/bekuvavilinifuxilafinoje.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6df78ff5fe469edb68b9ccde9421fd72/59337309987.pdfIn PDF document text
    • http://stonebreaker.at/gakatuzuwakopo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/77694331677.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/67129702334.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/xevebomazabime.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/gemigekokukixobu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/d00aebc111c0ac9a19b17d53b8508f7b/29790414763.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090e16a9bf93---bamukarofiluwazag.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/76951329243.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82672578977.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/69203427332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+green+room+full+moviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 16392 bytes
SHA-256: c3a655c6707c435a87f3a98e9c5605ee5b2d638e95b2ea3bc2472a11fbbc673c
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_02_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10360 bytes
SHA-256: 1b62a0d3618d4fd132ec4f77c9b7323f95267b4004e801762e4f6409a9533571

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