Malicious PDF — malware analysis report

Static analysis result for SHA-256 42af1e5de94d7827…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 03:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12353025869be43075cc6b211deca2ce SHA-1: 07fe1f656d8bbaa1b7bb400bdf16a0c50281f1bf SHA-256: 42af1e5de94d7827f0722e4fc046b4c270a85596c5e0e631807458508d850e3a
176 Risk Score

Malware Insights

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

The sample is a PDF that functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/flshnbinfj4bqkl6iknvn24nm5/fogofa.pdf In PDF document text
    • https://victorybear-info.com/userfiles/files/parebugizogovezenudumofu.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d55a4933e4---gurud.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210516090604_1387626517.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/29483335340.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/xepasukutot.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t3dtgntrglhejg2q7bobicddpl/27536030047.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ad481a11325e7566b12407a319e19250/kovezive.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4a04b8a---veriduxirobupinowal.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/30147885070.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a978d3f6---82335983537.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702cbea2857---sewivolafefu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/781d4f26a2a7654733cb9648f2ff056f/36864074053.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0fa2d96dd---gemekuzukaz.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/852f42c8b35e97df333330e2bdc511d8/45720929914.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/guzopinemulo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/surisofopofozomolujit.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/voxezudilali.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1edd5c4613---53569001778.pdfPDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087076d3c1a2---wiwifegufumepulokorilip.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/25189597454.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/72349632086.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534e5547d9---zonobuxupoxopomubiz.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/3854199594.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/99691410460.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4c79a15bdbc974118bffffd0e17179ee/25928026605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=human+fall+flat+game+download+androidPDF link annotation
    • 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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 21544 bytes
SHA-256: 0aaca7f8eaed5956c602a6630c7789f3abadd28d7a7ce3df5baac0c8d72f7f66
font_01_sfnt_off0001295d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14174 10704 bytes
SHA-256: 53afbf3a301561137d0bdf03af75d0615ed705d054e0a18a9d5a529c38d424c8

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