Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64942b9034a317c…

MALICIOUS

PDF

94.4 KB Created: 2021-07-19 21:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd5711f553e86f06a077b4692b59ba9c SHA-1: edd8e65839cf3a44167320e0c3b563bdf0896504 SHA-256: f64942b9034a317cf86abc6ca0e3881a15645d1335bb92266d54b3d81588ccbb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://alemotta.com/resources/original/file/zimirobume.pdf In PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/67233227028.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ef952aabe104ce4c4433a1036a2a7409/powisatukozuf.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c937815c---baregixofusidixupalajane.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fmtnmho4l91u5r5fva4rk93e0/47827786739.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/99844462882.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/61690389993.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/busumimazifetuvagezasoxaw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/15281912072.pdfIn PDF document text
    • http://centronegozi.com/public/66845492986.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fd37634f---kulikelakederazaroxa.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/55249837296.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/43875039247.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d8c6f79b---15487936759.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/figoxozijafeveworuli.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nupew.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/gotujelegupepodaledo.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/05/file/20210705_175228_198.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rk9dp9gs3aum91qnthomlnjbn2/supon.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/49075602096.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/zeloborekeretixa.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/rapijajogepowagawijejiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=webs+lax+crossword+solutionPDF 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_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17612 bytes
SHA-256: 0e2c13d757642b9d1287a99a73864d077b74a0436b1cc493122860ccda68d141
font_01_sfnt_off00013b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3F 10784 bytes
SHA-256: 7dc69aa9a4a0ef73d92197af448e8f59fa77d0bded255ec38cc3381f8b091a19
font_02_sfnt_off0001544d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1