Malicious PDF — malware analysis report

Static analysis result for SHA-256 834d314db2c3a7aa…

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6cae5a369844279b9c0b93d5cfeecd3 SHA-1: a78e7efda2471ebe18f95f4ce1f22b1e2574fc70 SHA-256: 834d314db2c3a7aa76ea2ce1a83987c696405bc37f86e463b245eb2cd0291833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, including WordPress upload storage, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pixomot.ru/uplcv?utm_term=fidaa+malayalam+mp3+songs+download PDF link annotation
    • https://piphoto.tw/uploads/files/202109120929003098.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///fonebesadubuximuponu.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630822352.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xilavabaxavuximapawilu.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109151417048432.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/44092652253.pdfIn PDF document text
    • https://webmenuplus.com/images/file/30784329787.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/libafozariduvosobozo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe1eafced---jakixozure.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/22364517238.pdfIn PDF document text
    • http://julianina.de/upload/file/19853871434.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/wosewawegamija.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a9517e61---65888253893.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630528304.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/mojutudopuf.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/40526668999.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161445d1e40db9---lopukopo.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/rugaruvizovu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9a42cbcf6---17054857559.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-22/20210922193420279118.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/kipabebipavurirezi.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091002533192.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/37936426679.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_off0000b7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 15696 bytes
SHA-256: b6f9ebca1235a0f6f7a4ef50f746cd398d493c6c55576eecac90b6df72d6a7a0
font_02_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10756 bytes
SHA-256: fe6799f34753525e7a0d9eee38b9faa837d14053bdbacf90de7632fe0b19857e

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