Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0483d9db0b7b780…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 15:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ecdd5a65b4afcf1c0d7c309d6b512d0 SHA-1: 73be328808610a6e8ea0759d3ecdf928485aafb8 SHA-256: a0483d9db0b7b780e149176f547c2a9cd65b6bd747f45e016fb9732e6eedc2a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external websites. Many of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an intent to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://allytemp.ru/uplcv?utm_term=alexandre+dumas+livros+pdf PDF link annotation
    • https://mmszke.hu/files/file/17909230766.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sawifexinajukafisudi.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8cac986ae---texufuvupodepo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/29047187332.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/likofebubomoredujosu.pdfIn PDF document text
    • http://jingtianlawfirm.com/images/uploadfile/files/sokajudubi.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/83484259321.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9aac83ca---93350200989.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077af5c9b86c---14387922721.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7p3sjulooccv8joog4vgblov0/95382885386.pdfIn PDF document text
    • http://195exim.com/datas/files/17734291134.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/51604045093.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a16292b03be---kijovimezuzakot.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc244698e36---48983228825.pdfIn PDF document text
    • https://laps.pl/userfiles/file/kisimekomadazutudadiponu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8vc3ec879ds9ni0aae5uonho3u/zajuvafojig.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/lifoxetagukududarediv.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/59361208275.pdfIn PDF document text
    • https://miet.hu/kepek/nepegapavuximadeje.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a147844adcf---8457859210.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/1vqp3i4lo3qsaaj9s8hnch256h/69818061898.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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 10812 bytes
SHA-256: 48a8c6bf481f866eb3b3d8325b5a6d88c0bb6e1a139459e0d176474c6ccc29fa
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 19448 bytes
SHA-256: fb4b49b1bcbec105530ac85cf7128c5a51e4a57ca1a07462e918eb682a6340ff
font_02_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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