Malicious PDF — malware analysis report

Static analysis result for SHA-256 a080b653c7e4102e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 22:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72ef4dc11b2ecb72f919971e4a66d34 SHA-1: 210b9075c82ecd0258227e44128e207582ba25b3 SHA-256: a080b653c7e4102e6d8934235d50aacba4e8d9b3c0fab3c393dfe9b18f4097a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=100+deadly+skills+pdf+free PDF link annotation
    • http://dienmaythanglong.org/uploads/files/65469986005.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/7068422253.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/96649687853.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/23895303708.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sawefupexogiwimeduk.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tujezuvazadareka.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff9b3cbc2---wakogasidi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16146393a9677d---toxuwode.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/vonaweran.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/6117696542.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/31646079570.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14328ecc6---65058207844.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/57316746326.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62586240125.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/4121963875.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rotefujotebilolukomerab.pdfIn PDF document text
    • https://webrobogo.hu/kepek/80554663175.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267f72575b---52211321237.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/bariwezolinofizeterew.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf059bcba5---jogopoba.pdfIn PDF document text
    • http://denge.aero/upload/files/80341402593.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/24786098650.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/71799078411.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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10452 bytes
SHA-256: 2c205c6f227ecbf5bc4c0b8a41a33cc8904b2ead68386235330e5effa6df47fe
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 17604 bytes
SHA-256: debe649ecd467fdb510e241d69d69cdf42f2c0a06a84e12ee27de119463a1a71
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1