Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a31403f53162a2…

MALICIOUS

PDF

95.8 KB Created: 2021-07-25 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a16ae2f19dcbff15da019b2c26e4a404 SHA-1: 5e446238948eef8ee2c0c660b21189e8817f92ae SHA-256: 47a31403f53162a2cd156067efef3f12468bc24767f837cf69f1f817e0b25514
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document that contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide clear instructions, but the presence of password archive lure heuristics and numerous links to potentially malicious content suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969dd4346e5---nupudimixalujutunigi.pdf
    • http://goref.ru/files/file/dupijemuxeniboxufumab.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/7d56bb72f183b60f78b882ceb189a49a/59229952473.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/fimunof.pdf
    • http://top1np.com/ckfinder/userfiles/files/tabivuzepaxababol.pdf
    • http://meteosputnik.ru/userfiles/file/pobadowipesufegu.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2cddbd32838792d08c9741cd0c644765/gosodimisikudejuz.pdf
    • http://marinapogon.pl/upload/file/vadexupopuxek.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/53edcbb5add88594eab0bf350c3df0d4/subugenedenavofawe.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0ffc4424---79401302036.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/emgk4auqcvks34llsoo29qg7vd/37584829275.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/45476815520.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28m4d8ot3vfvmn2aht2acue1lm/femitiv.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/70elpmjf5k94692rhd0dii374s/kezenoxepowivawidajaxawuz.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/caec80d6c421a92534d37b5e10def263/ladilubigazimatudesizef.pdf
    • http://vo23.ru/upload/file/52522533133.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/qbotfi6n457ser5u2ei2pkmh5u/lezimagiw.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873d674e2a0---rovibojatezonezumunuzo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160910dca93a6e---zasegi.pdf
    • https://hostessima.pl/userfiles/file/xaluvimopepu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e1fd18a9---14043014580.pdf
    • https://heatingboiler.ca/fck_upload/file/12963459751.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073035626241---xilereximudixi.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8541a88233---48134076363.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/834a0a173ac424ed954ac20fc7f842d5/sabokumumevefig.pdf
    • http://alibabashipping.com/userfiles/file/sixedevoputodelerenej.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/xejajevosozo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=la+ultima+oportunidad+carlos+cuauhtemoc+sanchez+sinopsis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f4c.bin
39ab450f0ba14b745326e0a3cdd476671f1daa3a92c016eebc532082f7ddc655		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 17648 bytes
font_01_sfnt_off00013c47.bin
3228dd1da841aaa7d4ae7dda6992654c59dcea25430e62cc9778e5c1e7997e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10896 bytes
font_02_sfnt_off00015548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15548 16792 bytes

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