Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f412667b75b444b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-02 20:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ea1798ac232ab764bb109cc55b8db0a SHA-1: e25a9921fd628829f2bc83310dfe624df09a6647 SHA-256: 5f412667b75b444b70bcdf1794672ac165634718e5dcaed7dd103190d15512bf
156 Risk Score

Malware Insights

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

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 contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of external URIs and link farm characteristics indicates a potential for further malicious activity or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://pixomot.ru/uplcv?utm_term=anaerobic+and+aerobic+respiration+worksheet PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f3f9263704f1038b845480190011165f/xuvazosesugexexad.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/zijezuvariwilijiro.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/26358813793.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7mks1l1ql68i77o03lrbm5hqo6/61395812819.pdfIn PDF document text
    • https://ecoretras.com/file/latotatuxupemipumo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0d5501b9226098ba84326c521f3939bc/33790162692.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4mb8t11j42m7l0llfha2cjht12/suzuweful.pdfIn PDF document text
    • http://3q1p.com/upload/file/2107011559544461888skz3kl5nmgv.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c347e78b20e---36461098825.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/25526546277.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e732c56904dd9d5dcc0a7d99fc624661/jokonusazunuzagironeki.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/af7a11b3d7296a43eabda2741f512a05/wedigifofilipesijexokami.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/51a20df376640ec7026a4927ac7087a1/5950147398.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dorekusupebif.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/begowamatol.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/39591291516.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/sasijeri.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/jarudutenelejav.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tobadakuned.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b6cdb245adee6509109aa246192363c0/reredixegemaraxarifepabu.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/42255108965.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/jokasalarizatevikotu.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/dujademojimazumimupiv.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/vobawojedeleg.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ddd1eafa6df2e925044780786b1671a9/83597576783.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fc7822b9---luxexugawavopaponasubozul.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/danabunewujanerijixo.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_off0000bed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED1 16044 bytes
SHA-256: ed08b067eea680178a15805128a00ed4b932d73fe972fb913f971240707f5271
font_01_sfnt_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10864 bytes
SHA-256: 89b880c29c421f8f1a277e723a52de7273e342eaea9c3d491ecda99038b52200

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