Malicious PDF — malware analysis report

Static analysis result for SHA-256 344d53d0802e7133…

MALICIOUS

PDF

96.8 KB Created: 2021-09-03 17:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a03cb28085bf0b29d815701d5950679 SHA-1: f1ff87b3d7d101ea4d8cbbaf84c212f3c421a1b4 SHA-256: 344d53d0802e71335afc2ad73a12d66ecb960eb40493425c916cbbdae0d93976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: 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 contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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 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://qishuochem.com/siicea/userfiles/file/29956764849.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22970bf576---suvotimodidewosujipodufu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc8a2387f---dotezebugukiteken.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/togomuritogikawixelafuto.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wilalanuga.pdfIn PDF document text
    • https://skspiti.com/userfiles/files/kenijewawabivuwigu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/56021259937.pdfIn PDF document text
    • http://oris-am.com/editor_up/toliruvaralavutabuguro.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/21401205584.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/gixupivoraxesurivinon.pdfIn PDF document text
    • http://taigesw.com/upload/files/64524864580.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/29882515244.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5343394628.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f98c5342c6f---23619765554.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/37979464553.pdfIn PDF document text
    • http://wohntraumgmbh.at/jolotunogob.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053baf015a---fowogidogifurozivoremo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/smok7qd3fbbieu8l6q89b2odl3/5907448465.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/85219309104.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/vonabajalabonafuzolile.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973f014cadc---naguruf.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/xofimipizizubiju.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/26811615375.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105dcbf9e291---pagumop.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/siwezojef.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/74131228445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=diagnosis+and+management+of+the+antiphospholipid+syndrome+pdfPDF 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_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 11060 bytes
SHA-256: a46b0181201d7eae3c5f910ebe00a521781c4a062e54f610719ddad4642c98f1
font_01_sfnt_off00012d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 18388 bytes
SHA-256: 673d48eb14f6585d616b918c988cc192ca384025ef5a728708686978e763405e
font_02_sfnt_off00015cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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