Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f4c38c9e381c15…

MALICIOUS

PDF

119.8 KB Created: 2021-06-27 04:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2293d160d430117de5f1fce3fea4f8eb SHA-1: 2df682a553b462f56084f518dde9da3d9a85c1c6 SHA-256: 22f4c38c9e381c1562b869ed9a1bab1ff6c34ef0870bd5bd6089aa42c7defa3b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malicious content or provide sensitive information. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/432bb7e006b3d2884eebd09b507a1958/dobejetapofetukim.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c01633533---nimakaliraji.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/86a9ca0e8fc49020e1774e9ecc170309/31194933462.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ba835e6a816423eaed6cf95f5cf71a20/73528590087.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb935e38f9---50098021452.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/goxodabi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/33520ea16ede14a773a832aabb441c86/95907298012.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adcf246b8ce---nofoj.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5e60naautc2te2cki8a8dab6p0/93344872489.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/72e617c0d3acf56d5990b1d1d6ebadb0/fuzagetekebixodajizip.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/90651652342.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942adc60dd3---66490887041.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c6f2c6d9baf4fbe049462e540daa60a8/lifesa.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/61474073037.pdfIn PDF document text
    • http://mobilenmr.com/files/files/39164644617.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a873cac3f6262281a3497ba13a30d272/vazikagonifarokaxifas.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbd152348---zisoxuded.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cf1cfd7d---tofogovakuzinulexuzi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3029531d60fdadcc841729e9278c73f3/xapomom.pdfIn PDF document text
    • https://avvocatoboretti.it/file/kugurejenodusenaladurag.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aeb338353d724683f509c4b80bc436b6/21093986611.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0756243a---muvelunizavabajotusofara.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/24382819534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ocean+going+sailing+yachtsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16521 20164 bytes
SHA-256: efee3a49e60380a7fdd73288985b6dbacc2500f0a9c5fcb9a86eb73457c0891c
font_01_sfnt_off00019827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19827 2288 bytes
SHA-256: a535cdbfd69382e52a3ec106bffe392fabb9e5d7f27d5ffb1e960cc68c0dfcb2
font_02_sfnt_off0001a218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA2F 10548 bytes
SHA-256: 8c419b5139f325b53db4053e244d7df71476035723d1c4324aa6285d755273ff