Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d36e7185617ca5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 16:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 532a78f1b64b0bc587ed344173904f29 SHA-1: bbbdc36ab852c82454ef714b0070a35544430975 SHA-256: 84d36e7185617ca57abf2f89d75a1891d85bed184557d9dab6f0154ad446b46a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://imobilestore.de/userfiles/file/20054954146.pdf In PDF document text
    • http://leaders-adv.net/userfiles/file/lunajutizimuzojosirotam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135504e25049---batagejivup.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b38b819d1---95319547884.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/29912688035.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/suzofojexekasofolenoxe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184c07cf8c---14486731123.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/binibizupavaboza.pdfIn PDF document text
    • http://trevorhannant.com/25573677064.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/43209434879.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/67639062439.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902130412.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jofijolerimiro.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/51350780282.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/puguk.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/12854704110.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/woxixubenaniwatiteliku.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/sukegopaketerowarosijezu.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48792586561.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/97808599935.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f524f50227---41257553935.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/29691148462.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/36174664621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jorge+baradit+libros+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 10700 bytes
SHA-256: ba5dbb630acba70bf848d26459b7ccee63f5d91bf6ead8be399ee9856fc55787
font_01_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B5 19764 bytes
SHA-256: 2911f6f14142aa786591ac0ef5d6059d6740bfbfbb99e990ab918b5d60e930a0

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