Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4977f34dd6ef87d…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 02:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eaaeb2dce459f1acba20927b3805204 SHA-1: 3f14a57cb3d2ba3865d6dc290b6594097fc03860 SHA-256: c4977f34dd6ef87d061d26274156f6eef8717365ac902f142534ba7b193ef370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607474bed324d---82720722041.pdf
    • http://www.findvoters.com/userfiles/file/93958432234.pdf
    • http://andreaslasnik.com/data/files/13785824450.pdf
    • https://bawwabatrizq.com/userfiles/file/xemakixelajudigulala.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4260192a---zozawadisofogafitaxefuba.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/13a8ed9a775c9c17e901bb990b297c1f/54498978163.pdf
    • https://vipbeachhouse.com/uploads/editor/file/xerefozopedaruverus.pdf
    • https://akapacha.com/userfiles/file/2233651373.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fdddcfeeab920866679aa2c155daf54f/81926826283.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddeb299407---kelebulonowazudosaro.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e18b58241---bomugewamura.pdf
    • http://df-2.de/images/daten/file/dudumiwixujerisopixiduduz.pdf
    • https://al-farh-iq.com/upload/userfiles/file/navasawenituvi.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/lejupupoxexujupigijog.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/4941004174.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5327573fcb---goboboduwiwomulukavoz.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ea5oshns2eut4qasn6qmltp2mq/11797455054.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c2cf8d748613162a7f25ee6984caf9b7/jizeboguj.pdf
    • http://younewstoday.com/task/userimages/file/30716697922.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/83555249211.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f0fb58958fde5ea560706bea206bcff0/niget.pdf
    • https://temahr.hr/files/77980140881.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160894e9c8cb53---68020806311.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=peanut+butter+puff+pastry+twists
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
font_01_sfnt_off00011347.bin
7b9db42e45df7ab56dc3d4928dbaff09c5c2f80f852e35bf7b8f76bf4e84a2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 10628 bytes
font_02_sfnt_off00012b96.bin
0d9b122150242fed9e6353b33997010cd49f23722d96f7a2eb8e808a06a307d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16824 bytes