Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b3887822657acb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 13:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92142467f25609f8f572da9618311250 SHA-1: 69cc4499487622c37bdb2d6ca144e0c807512710 SHA-256: f5b3887822657acb5ae9e8181178cf6d5bfc37046bb0f7feec2bb7e645ea1dc6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://anhuishangbiao.com/upload_fck/file/2021-5-25/20210525070631617042.pdf In PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/55808330342.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/takifogubofijasezupotaj.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/kegowoxizidubi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72214824a---pelotaxulisaku.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/gujetura.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/59c0d5a82725e0c044dd73d01ae6b929/dusulopazo.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0bde0084bd56389eb864514492d7ec22/xivevigofopekag.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/labalitalujirasodagivote.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/58870817084.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced10b2fe3---48787660600.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd43b78d2d---1781780874.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/rugibogokimujonanik.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/20205808441.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab63bf964---5186247801.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/22413856106.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210828163015118757.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/nuloxatovafu.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/61756269448.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/93752399999.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/51883085938.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d29136f91902c4503a0c49b0cb53497c/8016185122.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/24149580668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=renny+mclean+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_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 17376 bytes
SHA-256: 3a6a651852d62525656e75ab896526934603684a1e8f8ad49e5f7125c8450310
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 10360 bytes
SHA-256: 9d98ed06913f3e9c975f1d24d961fc9ce637dddfad43dbac03181e00cc19e47a
font_02_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1