Malicious PDF — malware analysis report

Static analysis result for SHA-256 44400a23dbb5450d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 09:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d637e10abf66f8e619129e919aba19f4 SHA-1: fb24a2d48cfddd940d00ab1acb828cefdddf7d1b SHA-256: 44400a23dbb5450dd8c2519c6dc12003208a910449091f408c42b58966097f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised CMS uploads. The embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://andrewsexes.org/clients/867461/File/gudirodakosixabe.pdf In PDF document text
    • http://metabolizmusonline.hu/images/upload/file/15644015164.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/03f94468c69a7167bdca337349bbfbbb/wobenijox.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/zumenipilodenosav.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/rusajodupoledovagatijunop.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/25179694025.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/45329964927.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/dudemokubipamufolixizo.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/vevudaririredememinon.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef98cf03c---bexagod.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/2p7fh5ggsvvptgs5rpc92iji15/90155605093.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gomakik.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/bosuzijuvipi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027a389483---75108278551.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/xepup.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/kixagipuvixabejolepiruxo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7f553460d5100d8d897200fef021d380/42010896082.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j59khluqvd11ljr23u7tvc7g10/meganenom.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/wedake.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/defixeragujusutim.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wazimijasoxomobonabot.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d921bd2787b---59651315735.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/74915905182.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/45ba7c9f92ffd33997674f78c0524be8/89758760558.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/71254930463.pdfIn PDF document text
    • http://sinostandards.net/upload/files/78680686343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=driver+booster+10+keyPDF 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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 14860 bytes
SHA-256: f702a355640fed7f0121a3c1a5049cc010e08eec227b6817ecba3773acbcbad3
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10376 bytes
SHA-256: 35bd38e3d996361153707dcb6f3ed2f28dc5786f739f4c898690338093dcdebf