Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbabc4d700c3692…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 03:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e073f6b5d2033110dcdd38bd9f23886 SHA-1: 78b0219a4b8f50c08efe30c3fc1abe94ed875580 SHA-256: dbbabc4d700c3692b70cfeb6ff1ebe1373b4cbc2307f7b616ed5e7171b89c879
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=all+backup+apk PDF link annotation
    • https://sharmtocairo.com/userfiles/files/5460279949.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/83536150376.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/61312611425.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/vusirekuzemumukuvir.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/pusifupuletibos.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/70723751521.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jipabapukuwizuvegiti.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/vazorotafudowe.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/jajokipidotixo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kizofonojikufebi.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/84320437372.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7af949508---xipapigupareduzevas.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/20986938904.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/38452042122.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1953aa9ddbf57423b6975d56be97e96c/85501479514.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/nikerexaturedife.pdfIn PDF document text
    • http://philipsphotographystudio.com/81360681745.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/37075045087.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85ee309a8---demekifonagoxikawokunekel.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/60783984461.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/26824639594.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/fexoxaxuge.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/gutumu.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/85785131916.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/likeludominesenobigabuwe.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_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 9868 bytes
SHA-256: 2e903d2d36c482fb2998fb1fcf82d42c3e2906992c8c6d7c9aea8602629ab2c9
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 18800 bytes
SHA-256: e8eb06fd73495a1fa0cb1bb4bab591b9fe922c156a9348529ecea0f18125adaf
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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