Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab30d13bb5840ba9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 23:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 577c224e6aaa6be856de0d0a1caa86e1 SHA-1: 6d7d09b8d73308ad5b8e4f9b5d361962e15fd983 SHA-256: ab30d13bb5840ba93b79a35941d6ea8ebbbf519210b769ff8a00c584948d058a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many links pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b7c3f205c4a1903ceaecada27bc60f8e/83471368390.pdf In PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/12790873827.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/76306326955.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f6878dfd0827b7c8a6168856919dbf9b/buwitalin.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/putiz.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/43571305917.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/36890136165.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/rerotisebipamamuwapomup.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/12657824680.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210731223201_lw270b.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/75666945619.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kekimosivanolaf.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/norozijimo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/a11sdbo8jvtal9vgfjr9fnvvg3/kozedagutarok.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/frcau8uc8tjb67bnuc0das1sel/jasivubujaguvaxijemej.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8c3ba681---dapupidenafed.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/98379331499.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/85782c5dd00cd97bf89c40c2f9713e78/85096147412.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/db48ad73f35f6dfbfefc7ecaf719df0d/70658792016.pdfIn PDF document text
    • http://usmleworkout.com/files/file/84717242223.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/ponepodoxamesuzozazonufi.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/60554808120.pdfIn PDF document text
    • http://innotack.com/userfiles/files/bakesulegivigupalexivig.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6749cb769---14940818594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=william+faulkner+intruder+in+the+dust+pdfPDF 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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 17588 bytes
SHA-256: 9592cc48b9746c51f8a5019dc451cda69709cb58719a79e473c76855f9755c89
font_02_sfnt_off0001313e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313E 10828 bytes
SHA-256: 39a23694f825d3c38bbff767eacaad5971760aafc0749d3a3d6b853da9eb24c2