Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4603c83e72d3f…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 12:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e927c856be75f6aaae785e3d33360e9 SHA-1: 81224d5fadfefe08d9592fdd1604727b267d34e9 SHA-256: ace4603c83e72d3f0b851faa032cebbfeac6a509afa4d2befdaca625adf3863d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of these links suggests the document is designed to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=ati+nursing+questions+and+answers
    • http://www.allatpatikapecs.hu/images/file/nununixizodenogizigom.pdf
    • https://spacio.hk/attachment/file/287812586.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/n1ifut8i5ui3134trk8ag0qvo1/biwexozoluva.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/59627253fa05ee1c0409426495ba37f3/xakowab.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd79724e908---48500583899.pdf
    • https://prtl.pl/userfiles/file/67273381818.pdf
    • http://luberoff.com/userfiles/file/77814968886.pdf
    • http://sparkpro.lv/content/file/76505738201.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s6g31f3u7vfsk5f4lshka9joi6/8827708240.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609447351f2c1---26011729518.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/496abbf1ef010265ba6ba965a705231e/zozurunoragifu.pdf
    • https://newtop-eg.com/userfiles/file/xilejefegelojowi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/90f41e80f665b5cb9bc2c4558a74ab56/bagemafok.pdf
    • http://cattaneoarchitetti.it/userfiles/files/88738923148.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d8192d99---zijezijilemosugemotal.pdf
    • https://kme.pl/global/app/webroot/uploads/file/1625271488283.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bekinofavagunobozamosi.pdf
    • https://harom.ro/files/file/62612904115.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/3902530913.pdf
    • https://alrukn.co/userfiles/files/98087420466.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d4d1d4bceb6ba4e0a0f1eb6e1a5fa3a7/nigurojig.pdf
    • http://asiavent.com/UserFiles/file///fonagotubekoxutula.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160829b1f2da60---21600405765.pdf
    • http://kurdumovldpr.ru/uploads/files/47755360787.pdf
    • 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_off0000d9d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
font_01_sfnt_off0000f1ed.bin
c51aff27657fadd4f53c1e6e0f8663e741fa39562a34a2e51a3bbbc4bb924d61
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10692 bytes
font_02_sfnt_off00010a1d.bin
4fce8bbe92921a37c9c75614a0e4fc85ac3273d28dd2ed6d379d50f249e4949b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16808 bytes