Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f13fc846cc8302…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 11:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06fba1b9eae30d441009e2f8081cb070 SHA-1: 2554950aa569ab60dd47d3df587dc0e633ccba5f SHA-256: f9f13fc846cc83023e4e1b80732658e83c9e92cf395e7bc71170285cacfdec06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised CMS upload directories. The presence of multiple links and the use of compromised hosting suggest an attempt to distribute malicious content or phish for credentials.

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://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/p2176n4qvq50kt9ctrfn7dveo0/zufokebapiwebu.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dcd52fd87a4443bb0beb4817040e8a75/29953484572.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f24c4b0e1264c2e7b01521e0b1f0a5d9/94213857553.pdf
    • https://gangnampools.com/contents//files/61925385260.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/rcqc7i64i5kcmngoqaiur516l9/lexizukapaxenemedevugupow.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091574005bff---89905699648.pdf
    • http://allg-gyn.ch/userfiles/file/34230706806.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7271f3876---jujetemesiped.pdf
    • http://wawabed.pl/uploads/userfiles/file/81667954741.pdf
    • http://ahchala.com/img/file/52947205671.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eead59c61---bopofuwazagaj.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a037f1a88---5004142424.pdf
    • https://jf-orvalho.pt/userfiles/file/molaredo.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fusomop.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c79fab61fd---jivesuwupatadezef.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aba38bb2b46---mugemipekanogonubifupejif.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/59570823019.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d991dca601---gitopudawu.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/39789016228.pdf
    • https://samarpanbharat.org/trila/userfiles/file/jeguzirilow.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2623e81a---pepipasep.pdf
    • http://fatamorgana.fr/uploads/assets/file/57817580256.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ribn94sv5f77vff6lab6iv3v59/74179339550.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=video+facts+math+test+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f863.bin
def56c8cbac4824a9597b6d86d263835311beec1023b6d183ccee483d3dd0d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 19796 bytes
font_01_sfnt_off00012b8b.bin
4bfc64156d34b70464481a6c6dcd2b4305ba4494a635d43eea781255cb9257cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8B 10748 bytes
font_02_sfnt_off00014425.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 16792 bytes