Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b7b718e87b3919…

MALICIOUS

PDF

101.2 KB Created: 2021-08-11 20:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f2dc1da51420830789ed6e6192dbf467 SHA-1: 4b5dca0025bbcfff387754bfb4cb976633261a4f SHA-256: 29b7b718e87b39195619afe75929b5cecd84fb4c3850313e31333ee07803e903
192 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a high number of external URIs pointing to compromised websites, suggesting it's used for phishing or to download further malicious content. The presence of a download button lure further supports a malicious intent to trick the user into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=what+xcel+gymnastics+level+am+i+quiz PDF link annotation
    • http://ronaldtan.nl/images/photo/76129365142.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/28044548639.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7v27m2ai551l65a69ib9sj6ro4/dugodafiveranelaf.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ecdfdd1d7b206f4087d0b5d444f04f7d/wugamojekawetazobiver.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59c892bf8---ropofor.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/53899127882.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/futojovajawizo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/88356509798.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/josakujixufotasusesepati.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/lekivomeremupirimukef.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/vurivabejovud.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/95345059750.pdfIn PDF document text
    • http://hongdacable.com/d/files/48014602236.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-14/20210514050607900985.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/50725942846.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/nowibad.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a115ae1d0d0daae26b9d92661602681a/63094358930.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6fbd51792---nelekegatebadevetodijuvok.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/30464656581.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7747196d1e5793f5bc4affd0cd799d0c/sisidetafatug.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94135917---fuvamexonelewul.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/3hpec7vuieg4a52qcur0eh6o72/2920871756.pdfIn PDF document text
    • http://cartopack.com/Images/file/xelalisenisuvagodogoradab.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735fabbf1cd---gapivejusu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tb4dpeg057d7lho2q1eftsbq06/3768210743.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/78192301200.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_off00011fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13803 11040 bytes
SHA-256: c9b2a01de48df718f5d556da710a3b7b7f69072a5a2e270c52c47f0cf2016080
font_02_sfnt_off0001514f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514F 19488 bytes
SHA-256: 4f27de14e707e90eb0fea3a2ff7aa1affc486dbb5df97cc265bbe08745196f49

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