Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a95088df2f245f…

MALICIOUS

PDF

93.6 KB Created: 2021-07-19 23:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8c90cf044875afee51c0f0fbfc4243e SHA-1: f79040f7e18ed35a9b63c6068826fbeb716fa2da SHA-256: 56a95088df2f245f3d00105c8b8efb0c7a98d72bb333671448cbf4efb1a40812
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable domains, suggesting an attempt to lure users to malicious sites. The document body is unreadable, but the heuristics and URL analysis strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://comp-art.ru/userfiles/file/77057433538.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/80942354a00fa5de63055066d5aca652/24902114771.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609498aadd53f---54076478543.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/ca497f168b3a2fca7ea7a706fd2996c0/91853953719.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/87v56smqjphhep14ckq7gdrf94/komekalapowetamotol.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/55001036396.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/puligalera.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d900559564c---sifafaxugilodeliludokew.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vorufowotugetofoturoweso.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/17228855904.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/gbeclpmqph99a00r3hg75kvub1/73674652976.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vqfvv1dt2s7r7a1e6pu2cen585/sibuwemi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16099571902307---27529216681.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf23ae70fd---wuzimanijewu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/98786833817.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/bekoribawupuvozolakakov.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/daziworujulejidapilibobej.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/83703594114.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c56e191698b163b4b4762f2fc691dd26/96243621612.pdfIn PDF document text
    • https://majubesar.org/contents//files/50691914492.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f3f318fba0ca39bd24a86a338e946d3b/27475332907.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/33183347593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=explain+bronsted+lowry+theoryPDF 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_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 17492 bytes
SHA-256: a42b4eada9a40cb8bb9e9fad187a407325991b216cc738d52804524112b391dd
font_02_sfnt_off000138cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CF 10912 bytes
SHA-256: 55212c22786ac0b90e1bf09142f72d0c6967b54925e1beac54a329dc3227eb3a
font_03_sfnt_off000151d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D8 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68

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