Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82d28a1e3375140…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 02:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c06435c5be147e9e5855e68d3763d7ef SHA-1: ac2c08e540a7377b207aa66285bec9308239c534 SHA-256: b82d28a1e3375140aea19971260d015371d8ca8cbad9adce27d6b4c5f8a0db33
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://playindiano1.in/ckfinder/userfiles/files/bixebukakemimesujenul.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613977805e51c---10797423857.pdf
    • http://szpitalstrzelin.pl/userfiles/files/sowokeba.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/vapabuxibaku.pdf
    • https://vinatech.com/userfiles/file/pusaxenizugajovise.pdf
    • https://24emk.ru/ckfinder/userfiles/files/60536092164.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75608871597.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/pasigodonu.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/13161601602f1bf3b3c04e7611d44369/vediluxurepinomarowe.pdf
    • http://humanitool.ru/userfiles/file/fomijizaja.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd8a0e767---86035572214.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/58360394951.pdf
    • https://weddingitaly.jp/images/file/41947770568.pdf
    • http://linker-apps.com/files/17796482553.pdf
    • https://tonthephunglan.vn/upload/files/21158720697.pdf
    • http://songpinhao.com/userfiles/files/tabezipovojabizexedog.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d721dc469---24497465123.pdf
    • https://daulte.com/ckfinder/userfiles/files/34833258482.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5eae04aaa---wodepitefapezijovur.pdf
    • http://halmar.info/userfiles/file/gosibikenemujulunef.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/32203339864.pdf
    • http://ranczowdolinie.com/files/zezijapewokoket.pdf
    • http://st-johnson.com/Uploadfiles/files/movakemelebi.pdf
    • https://kimcert.com/E/file/67436029915.pdf
    • http://afro-safari.com/upload/files/mividalizipakeropofol.pdf
    • http://an-professional.ru/img/files/file/82755272363.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=8+ball+pool+1+billion+coins
    • 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_off0000b523.bin
1ebc4f9ffb77f2b7947e7a63a15b05c0d804d01e57cbf8d17ab1a7f5705ff537
pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 14704 bytes
font_01_sfnt_off0000da2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 16792 bytes
font_02_sfnt_off0000f241.bin
34278127c27f2f86a40023e2e5db656985bb38cae73986ec133c121992a45aa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 10340 bytes