Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0c555f37a4e862…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2948294b482e451dccd8fa75973b31e2 SHA-1: 2ff7b4183466652bd2ed15393ec68d701bf645b8 SHA-256: 1b0c555f37a4e862e5811666c2384a1ee4dc8f9ac7613b0d76696f856721e0ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised content management systems. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=jurnal+variabel+intervening+pdf PDF link annotation
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/viselawukamatiwaben.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/8062263542.pdfIn PDF document text
    • http://indexone.ru/upload/file/buduxokaporofejekiri.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313af033a62---sukedevotepin.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/12033775530.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/88834209785.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/85306418220.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/93271993511.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/20462624531.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/zivisibijakupapunebodixoj.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/metapepuduwu.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/36945564463.pdfIn PDF document text
    • http://zenkatsu.dk/files/guruxukumi.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/30f5b8dd4c9c00445ce3550f623e3f5a/jibozogopegolodadesada.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/tevuzovomito.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/12189453613.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/savkho1q8aeamuc816m7d7qpdp/wawaw.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/geroseranix.pdfIn PDF document text
    • http://teakdeck.pl/files/file/lexeremesutufepumeras.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/borawulibunipoduf.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353e2c9a21a---kasesamajedumejabun.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109081353311421.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b8377242d7de77584298f5c2df6ee4f/14821176241.pdfIn PDF document text
    • http://rld-carbon.com/file/momokonejivaravugukosano.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/gubomijexuxotasan.pdfIn PDF document text
    • 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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 10680 bytes
SHA-256: 7380c43b090c4b643f6ae11e18c645471ec9c1531dd38e69ddab54f8f4aa9959
font_02_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 18492 bytes
SHA-256: d4e6bfdb83dcc1e6455a97122deb759fa0d68ec7244441c50a70610d7fde80ec

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