Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9f2a35c9623028…

MALICIOUS

PDF

121.3 KB Created: 2021-07-02 21:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b1ebbd54b2910c6140faed76de88a78 SHA-1: 38221126ad1008e38b6b97e15434ea4a722d7bdb SHA-256: 5a9f2a35c9623028437e1b4ac080679812c71114e110015397e0271da79b0242
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'SE_URGENCY_LURE' suggests the document content attempts to create a false sense of urgency to prompt user interaction with these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://opakowania-loga.pl/zdjecia/fotki/file/sujedorurodolejavexawab.pdf In PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozarirafofufaker.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/lijofosazefegozerovag.pdfIn PDF document text
    • https://xistenze.com/files/files/79268363503.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/banod.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1112deb9112c47fce25e88c27db1af7c/32774646499.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e8e5b7dabb7e0c000340e7c7ea71b044/10583824864.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/bobidegapi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87ee841c1---46220914153.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a587db25a8fb5948350a52d249dc1ef0/63611299749.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2211f354b8---13954205562.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/zupakejokaw.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xavolafugimusozuvodule.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4689703b---notaxavimibamidavugoweza.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/66629786746.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3793edeed---foturibuvu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///49367464984.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/jofebavijetopixo.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/juvuvovusagetu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a3fbc12b84907fbeba696cfaf75ff852/8009322135.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160976ab90995a---42473474308.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/60941055603.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b25fe3809ed---15466715336.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/sugiteridenedejasiveve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=genesis+chapters+summaryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B93 16900 bytes
SHA-256: f76b851212adc4684f00906319915c63aeb2642a870d232ab434b54e4083e83c
font_01_sfnt_off0001a763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bf7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF7A 10728 bytes
SHA-256: 344a83eb5eee1872486ada306934d57af8df415f91d3d8481be27c385c56ee56

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