Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa5c26af3856a13…

MALICIOUS

PDF

84.6 KB Created: 2021-09-20 08:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2103232df8d4aff1675a15b4885e5d92 SHA-1: 1de6a89f4e3647cc98a96d192a96f18d93ff27af SHA-256: daa5c26af3856a13a931b0e0606ea279849de88d02817977ca894d7f9533e1df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the final destination. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://tidurmalam2.com/contents/files/40771905414.pdf In PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kelozax.pdfIn PDF document text
    • https://bauarch.bg/files/52495631635.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/90576314161.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/2578333088.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/38282423573.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/88275042200.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346151176d5---pajujubezusimozesiramike.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/96751897932.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/niminemaxuno.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/jexav.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d95ebf89---kopimisutisabivutobe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39573e1e7---33313599518.pdfIn PDF document text
    • http://wami.cc/data/files/bijomotisedibusiziru.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/46764571849.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/jogipedanafig.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/parelowim.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/gobixafawaxepivawep.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614626394ef5f---dibaraxefigijojig.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/pikamulilatusa.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/95116362045.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/podesubidifap.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/93471851036.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/73554969608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=movie+apps+for+firestick+2019PDF 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_off0000e5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DA 10936 bytes
SHA-256: 698d9103159298971dcffb6ac3b6f221a86fd31976d234f8423b09c90fc55a9c
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 17468 bytes
SHA-256: 6748820bceb39a359483d7de5ba6b05a213d7df6048ff680dd062768840c7d90

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