Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0b8725aef63bd1…

MALICIOUS

PDF

77.2 KB Created: 2021-10-08 00:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43351ace24976a2652371aea095664b1 SHA-1: 48184950231a35e9ec84dbfb7619794d64ec8d02 SHA-256: 3c0b8725aef63bd19b3db50be26378712888e850334c576d18fb379dcfa0a285
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=characteristics+of+modern+poetry+pdf PDF link annotation
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jbgp8frl4sgeds1g0o98g2m6l0/kixujijarovan.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135bece3c77e---74851821684.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/lemijujorekisimufita.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/sufenowavesufejabavob.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/vikexiw.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/pebomonizabomasudigibeba.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20211007161313_1564547109.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mosamured.pdfIn PDF document text
    • https://clickbox.ro/images/file/34262319725.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/34416914829.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/18993692751.pdfIn PDF document text
    • http://tzsunup.com/upload/32537095734.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/58554249840.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/85703046241.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/gavetaloguzigolovexet.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/zawosadotikenakolifafagi.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/18912314422.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/27280585925.pdfIn PDF document text
    • http://mosjob.ru/images/file/65749096139.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/31707943066.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/78754205647.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///pesinon.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3a5d86a2cb840aa2d0e7e9546dc1be22/58815540418.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D8 19420 bytes
SHA-256: c01ac30b3cc009109092e2e7a9e1d5d84b091a8ccedcf440b582592f13b6f5a2
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 10984 bytes
SHA-256: 5f8af22639c2bec495254ac0dd490ed7b07be0ee556c2215e59c3fe7da359c35