Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99a50bab495b2fe…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 14:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca105d26011f9453bf55971c5a5d9438 SHA-1: 53792b9e1af1bc4a73a3327fea55d6a5432ce270 SHA-256: c99a50bab495b2fead854153c989a18599d5a0c17bd6608ef640b03b1a18c6cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=how+do+i+get+my+pictures+off+my+old+android+phone PDF link annotation
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/82787460605.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/97647278761.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/87013570904.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/kivewowojokoniwowerilodep.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613671f910d0b---93556110483.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378a13d9157---41648569748.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/delolimefog.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/woxifukaxanip.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17fbbaa05---81899422847.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903183000482531.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/dexil.pdfIn PDF document text
    • https://vestol.bg/files/file/kunuzijipogegijage.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/sometafigurisatuva.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/87689070403.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sebonidusidi.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/bixevifupureg.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a92101ea9e---94871608010.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/wofobozavuguludalotinodip.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/bapasorumixime.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/24401453593.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/bategixijakivomigera.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/68562422188.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/55334091288.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/23072903311.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_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 11360 bytes
SHA-256: cbb7a664a76cd64d8b7649390fb42eb3ee07ae14e3c59d97ccf1b9e00bf48c62
font_02_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 17620 bytes
SHA-256: c43ed368753f4c0fa3f6af60c703969e40b0d70dec148e51a2b461f509f1a7a9

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