Malicious PDF — malware analysis report

Static analysis result for SHA-256 488dc50d10088be0…

MALICIOUS

PDF

110.3 KB Created: 2021-06-29 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9e3405965251fb09572e9d00ae529974 SHA-1: d6874dad35800673df81dee4eb97b7201c6c5585 SHA-256: 488dc50d10088be06ac982f3e0459713c276a825319b27af829da881d821e4e2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm and compromised hosting are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://krisoc.ru/uplcv?utm_term=spirited+away+dubbed+online+free PDF link annotation
    • http://amuseonline.com/absite/userfiles/file/48583605332.pdfIn PDF document text
    • http://toonesk.com/upload/juman.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085f298b4b62---malofopiwafugoji.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jebaroputupojona.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c47d8b833---wexesolosotukabuxodadib.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/65437139275.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba365138ddc---xakidivuzij.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607607e4a9fdd---95482658646.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/8349524065.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/of8pljf7l1mss7700ifsmh8aba/96481967728.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac5ae91d6---89001874610.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/guparixu.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd7b11f302---jafemeruxirewanezo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/451621c395a417c2bf094cf3c84d54bb/24365292820.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9021fb04d6d7e8af2b1972ae80fdbd6a/17618624690.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1d42b40e---94358657107.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/561db9a6adf967c52a0f7ef0c282566d/56717686282.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7992b6a4---gepudufanigiwikemu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084882a007d1---14045731017.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bagawigizibukuvabelozo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/cb018a1b4d00843d86ba719217e875d7/vovemepamibuwije.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833909b0c75---tusejekukikekelok.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2616bb7c650f6efed42f9388bb3c1844/vavasetize.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 10840 bytes
SHA-256: c5ae2ecc19f8e68d7fbd65d89e7404dadc47c5b1099d27d3d7819424e75c1283
font_01_sfnt_off000156a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A9 2744 bytes
SHA-256: 4486d6964cb36216fbc1634a39283782c581b54d0f4ecb3bfb6679f420657ad8
font_02_sfnt_off00016251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16251 18200 bytes
SHA-256: 60c9c325c884c4df4b943a88e8a72c9b5107da06c8d7b1616bd993f329fe366d
font_03_sfnt_off000191d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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