Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1aa563f86d68de…

MALICIOUS

PDF

84.3 KB Created: 2021-08-20 05:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 89ac2a264b61056d9aee6cae47f019ff SHA-1: 840068b89a03cfb9fa27c648523e85b6d046d48f SHA-256: 2d1aa563f86d68de8cb23b74b125699e8fb89fe5b4574c328deaafdb607d11c6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and disposable hosting domains. The heuristic firings indicate a link farm strategy, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/31ffd52a9018742c5944d90579a64875/rozasekikapoba.pdf In PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0edd0a95e27e095621a1a6620d9a9eac/42484824866.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dnpfn8lqt96t8qlpajgbpgijtv/23975613072.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/wawamisipemo.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/5230974906.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f006fc0a10---jukube.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e95915bc3---renapuk.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609873ed1f989---43673979892.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/lixaxumumigasa.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/duvanetoxiwa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7u24tkm78k27j3l7ljchi40j65/42578190395.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vetamige.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xowufamepoweba.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc42ced0613---jumabefisom.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/tupajitobegap.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/548b4508fb4281aa9edf5057ba81efbd/59237414988.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/susubujuminojifopi.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/63557742599.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/wimanezogu.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gonujoketazaxa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc7dc87930---73344445035.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/25201882102.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b90f40f8---zowuwuponifozekaseril.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/9987971980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+geometry+dash+apk+hack+2019PDF 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_off0000e261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 17232 bytes
SHA-256: 3feed5558d2c49a9bd57c645776e061fe27c024313538473bb4f66a381e3df1a
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 11388 bytes
SHA-256: 93a537769a20162a8e98562011739293aba04bce00053b2627698e4078f27326
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1