Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ecddf5942aa92b…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 08:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 811141484acb973152ff6255debe9d96 SHA-1: 3dd729b159b86d04d12fbad017bdbc4d62206c2e SHA-256: 57ecddf5942aa92b7fb0443ebde064ee0faa897cd0d29648c30e9eae8ed54b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://lagunarent.lt/ckfinder/userfiles/files/litikajuxalavos.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8ec1816fda47566d3b54fee7720952e0/45550505646.pdf
    • https://netlandschool.cl/files/46583633091.pdf
    • https://avigailpekelman.com/sites/default/files/file/zupovoduvagux.pdf
    • http://euroteam.vn/ckfinder/userfiles/files/jowovuzexitelowom.pdf
    • http://qiuyutv.com/userfiles/files/20210913015221.pdf
    • http://cuoredicane.it/userfiles/files/wusabanemaxifovidipokam.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ccca4c85afb099b2da3eb9e23cc7014/maxakedolut.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/53594770882.pdf
    • http://budka39.ru/files/32314168774.pdf
    • http://kzlo.pl/fotki/fotki/file/nezorivuvetarabogizi.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mugapupu.pdf
    • http://wecans.net/_UploadFile/Images/file/74006147825.pdf
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/1850523630.pdf
    • https://npkfertilizerproduction.com/d/files/dalorifufir.pdf
    • http://achwvs.love-mrt.com/upload/files/62628812348.pdf
    • https://tinhhoaxanh.vn/userfiles/file/89487190050.pdf
    • http://ramenzoni.eu/userfiles/files/13552245699.pdf
    • http://cartopack.com/Images/file/nukekol.pdf
    • http://sochisushi.nl/survey/userfiles/files/40092399285.pdf
    • http://ahcxdq.com/uploads/file/160632383781.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424167c5ae3---87406106996.pdf
    • http://maychebiengoduykhuong.com/media/ftp/file/wipunasa.pdf
    • http://szzxwx.com/Upload/Upload/file/20219152148586481.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/7147539808.pdf
    • http://stavebnevyrobky.sk/www/upload/files/rinapexabexofiponekowu.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ja979jk1jj3uu4d4trtrf1pprl/13996727385.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lock+and+hide+apps
    • 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_off0000ba2a.bin
c745c77feaeb4a42e54d9180e083db91d00056c8cec43d897ddbb0fdebe2e8bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2A 10416 bytes
font_01_sfnt_off0000d1a7.bin
ae89b17b34de471227e05eaa395b25981738fd7314d4c3b1831144d0202c470a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 17728 bytes
font_02_sfnt_off0000fe41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes