Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a9201201cffcd…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 18:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 33701a3556c7752ed80020f9c3482848 SHA-1: 52adea730c38b0e7859737d3600af440e7d96dbf SHA-256: 841a9201201cffcd6fb7c9ab8f76c6b6deb1a93235813edf4393665bb53e04c1
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised and disposable hosting domains, suggesting an attempt to distribute further malware. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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 http://summithigh75.com/clients/867147/File/47106050712.pdf In PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/69980859219.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083916167a9f---79617313960.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acb262957---46216544106.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/56235281894.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c86c6be77aa---tefigiteriwazekiju.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/1c903c7f1a1ca1abc93886696b48792d/bibiwuzanuk.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/96903449459.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160765bc32903f---zenusi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vedajijutixasedujilefu.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/70454018772.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/dajafekenulabenebo.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801a0216f3---fibimolijunumemowujarexi.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091f24711e7a---80007777763.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/74895187534.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/32089580761.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5397e323ce---sizimurilujo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/61g30mmulvojd4n6gk6rfoil3b/24784176996.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/70495441453.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/70d845d9bd85543a6f8ace646193fe8c/73744704685.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/xesusejupudakid.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hdsls8i2q1604atpqqre9r5pd9/zovuwiv.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/14626186544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=yu+gi+oh+legacy+of+the+duelist+download+pcPDF 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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17268 bytes
SHA-256: 1822a579506e8f9d0ccb66ad418f0058c7dd3939f551d57760bb4875bfcbbd18
font_01_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 11084 bytes
SHA-256: fe18a2deebf674054d34834f5e7594accfc371e32a8c45455958faeb9406eba1
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1