Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc6d815839714c…

MALICIOUS

PDF

93.9 KB Created: 2021-07-17 09:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 257c70daeae34ab793abc4f652ad6b36 SHA-1: 2115872a5e5b29411765e69b14a67b643ac3e437 SHA-256: dadc6d815839714c175290e424cf62b7f39e122c30e721c3b4195645a255e56c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2f0ed010---mifogawanevavavom.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/s112a7hags4rk2uhivei6rrhr1/361693737.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/68724358261.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/55295354133.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ged8e2akd1ckmc8smq0eoo6vsc/povuligekesatusenixa.pdfIn PDF document text
    • https://lesura.net/userfiles/file/69204328442.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6cabbf329756da6f415c0c22f9ad80e5/kifigesovufewawegod.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/jedabupe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31db90051---91392631830.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6ef066de---zisifesuxomuxamijes.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccb76d9b8---fawad.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/60910652660.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d66984a5e---82721934082.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4rnk2djkstlemnrah361984jfc/lotarezuzinunuratibubo.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/mosoxanefuditubovuxefe.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/bavejawuviluxenabobekozuv.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210618130027.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb00503c7---62292800524.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/a0pd3gmdmqtgn5dpptu7p3u3is/65017884431.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160718a046e0e4---milokevapepimudawukapet.pdfIn PDF document text
    • http://midel.me/userfiles/file/riruxibubew.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd9a3fd09---situnad.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609159756c5c7---13337924063.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/69962887203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nilsson+riedel+electric+circuits+10th+edition+solutionsPDF 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_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 10556 bytes
SHA-256: 8b4830b1fda789dfd219a03ed385e63ac471bde5bce4ce896940211fbd950c6c
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 17556 bytes
SHA-256: 86eff83b5c5c8e81aa99bf206f3a993686a2d74e5a96b9f6ddd26bf9d9bca771
font_02_sfnt_off00013beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEB 16148 bytes
SHA-256: b82c82d321bc0e5cc4f11409e1dc0c89b3ceada5443f3303514eaabfd4b94ecc
font_03_sfnt_off0001517b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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