Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e458d5345ff37c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 02:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb32960d31e90cc08c535af54329346 SHA-1: 77f4cb68c79ced9a66a53c06a0e937fb29642050 SHA-256: 70e458d5345ff37c4ef46123217c55ba2b487f9f013bd26a56ea64f95a5dc39c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of a download button lure further supports this, although no specific script was extracted to detail payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chromowane.com/userfiles/file/jejozumij.pdf
    • http://allefrgycg.news-read.com/upload/files/tuvovimu.pdf
    • https://philly.drinkpoint.com/uploads/files/vudutaranixezisiza.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16133a885d0d8e---ligut.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/wibovajizabusatekuwosat.pdf
    • http://nutranghongngoc.com/media/ftp/file/bonik.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ibsa3dmkb4mthqc3khlm8nk0jk/lokuxeruxawunexetak.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/wedol.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/6217691994.pdf
    • http://jingkangchem.com/upload/files/fofijiluliduwuriketu.pdf
    • http://www.mousumibanerjee.com/fckimages/file/38804867782.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/7510312422.pdf
    • https://fasaac.org/temp/files/gawimimep.pdf
    • https://istanajpdua.com/contents/files/30270737062.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/xerunowowosasosojulorixo.pdf
    • http://magnumprint.ru/upload/files/gisadetet.pdf
    • http://zechnerbau.at/images/content/files/suberelususab.pdf
    • http://shrlie.com/upload_fck/file/2021-9-2/20210902190007867075.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ab432ed140c62c715c65b84f554dc6a6/nawumifodapifeludogafu.pdf
    • https://coffeetuanvang.com/Images_upload/files/66043431187.pdf
    • http://ownlines.com/upfiles/file/58493311158.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/garetefidagi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613299280546b---76088966665.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pes+2018+apk
    • 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_off0000d7dc.bin
d4af2800bb99cb630221ce59d9296c98ac0a649614a98402588083f57c69edce
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 10280 bytes
font_01_sfnt_off0000ef49.bin
d5639329fb054171a397f20d1d5b57a057eb97eb490c54c60379b4d3a2476cb0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 21316 bytes
font_02_sfnt_off000126f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16792 bytes