Malicious PDF — malware analysis report

Static analysis result for SHA-256 22418da6a9873459…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 12:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c70b1f11cfa39b4fcaa11f7b7f62126e SHA-1: 02e6e604f86b806db1264d0fb94919491201a19d SHA-256: 22418da6a9873459e6a5099ef2f694744c645a222da5373fcce38f7ad4484066
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many pointing to compromised WordPress uploads, suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this file is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=pronunciation+words+pdf+download PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609efad7e8ceb---nuvurumexix.pdfIn PDF document text
    • https://securitydm.net/slicice/file/15615732577.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/16790213843.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/35217594002.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/65681509927.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/mepujawoneze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607857e3cc641---63671265709.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nudubisalode.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/82283662507.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/p3gbt0gfrbs7708l9ire784mqh/temefusurofabak.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/bosojozagarodoxak.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f6c5b1ba51774b09749f135c48261682/42560240295.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8f1e8339---64695473465.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/lidagoninuguwe.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/mumulesomuxukobebuba.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/bisulitobagevetawisivut.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/82041633411.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/45vpnisriah7ru8639glst8ud8/vavabuteli.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/378993318.pdfIn PDF document text
    • https://mfdesign.hu/files/file/30540740668.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c837419ed634cfab2bf45eeaa2abf709/61502912755.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1634c2e42---ruzakuxaxitipopepakedusi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/19291626185.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/sobodaterogetobixukutedis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 18916 bytes
SHA-256: 74dfd3446e826acf0506544ff953cd2dca16044dc7f47f1972dda146479be89a
font_01_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12691 10668 bytes
SHA-256: a125b5b9cff8ddc50479e4a36b51000fb5311e5d6c5d0eef4e30fc2dfec71c8d

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