Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1cdc96435a66cf…

MALICIOUS

PDF

108.4 KB Created: 2021-07-19 16:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16e3604e3acc6605df12e39b0523d2e1 SHA-1: b0b1b447beab84f9d91b5afc57db109212f05e7f SHA-256: dc1cdc96435a66cfa9d786f752214d9a4bfc30015536c345728d04bb47153238
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b384ea86---7801402153.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed62609695---12419014178.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992b03c7431---25328238151.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/xuwejimosurudu.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dca5d9da3ca---baguxemuwepunamazepag.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/efbc15cc55188c46963ce07818dfa8de/34100576725.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607563634878b---sagapuxejoxebogukoso.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/vl5rbdd561puhpccngbprevif5/kawobipovodega.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/31840259933.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g2u5qsk68lpfr0p272p0mut6b6/75999262409.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d8c79f0e---4846651540.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1234679697---96618147287.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf01968c671---jaromadasumisuzev.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/uqta82lqtu496frunp9jhnqm0e/jelidawuxilakana.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/kgmjdi3aun02rtooqoau48hht2/18704035028.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/kpvlf8vc7bmq16jhe12k36tc25/4889689378.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9754ggkqnea37doipr3ilqdc4e/35143126001.pdfIn PDF document text
    • http://attlas.center/userfiles/file/ligisonawiw.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210608234945_ph7ewx.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8496754d---44567609068.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/lewuv.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/siwinakuv.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/sasodexelapetesoxodovig.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/67901584594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+bambo+flutePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 16600 bytes
SHA-256: 59c20756f53416fd4f44e332894f1d2b99e856d9e58ed4b242e7606c5bbf548c
font_01_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 19704 bytes
SHA-256: 83f38af146e0268df3cf275f89529c215cfafbafaeebd7a17f5ef1106c41cddd
font_02_sfnt_off00015464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C7B 10320 bytes
SHA-256: 9213aba732c702a523a006c36a770cd31169d7ec250f1cd432c40222aed0aa32
font_04_sfnt_off000183d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D0 9888 bytes
SHA-256: f5c26c455b99b155905bff221b7679383ea0e4bbc52f8985645d42f23fa1b70b

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