Malicious PDF — malware analysis report

Static analysis result for SHA-256 29dd14536b68e839…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 00:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a3f94507a39c8efb51bfc065cc63cb36 SHA-1: 372fa731a56d8fbde13309f4eac349d6756dce70 SHA-256: 29dd14536b68e8395e5c10c3942b863a0acfbd38631daced8389f8f7805e54ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.deco-interieure.com/userfiles/file/95104992835.pdf In PDF document text
    • http://way-of-spirit.ru/upload/file/11331623036.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/49555165435.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/51135960108.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/pegarijiwebafedelenopu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-18/20210918212656506531.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/xuribobaxapi.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/24643592490.pdfIn PDF document text
    • http://zimmerei-possert.at/28624186232.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/tasutu.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xedivulatoxiko.pdfIn PDF document text
    • http://datcat.vn/2018/file/4496713654.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f06200490---lajasudofedisexetanukipi.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/60487774725.pdfIn PDF document text
    • https://ubranni.com/uploader/files/58639982008.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/70531165790.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/67666117320.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d633ef95---67391591125.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/jovusujo.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11699141598.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/58000741159.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e5dc0537---vawipoxeminaduloxofobu.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/duxumafabufipisijelixuw.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/bimifiweluziz.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/mevamidetilapufoduzow.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/56725923575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=motorola+droid+1+reviewPDF 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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10168 bytes
SHA-256: b2d4de4674789bf31694e87e4a229480fad4b3201d18f15415d2561e12ad11c5
font_02_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 17808 bytes
SHA-256: b90edb58fcc4de6877debb37ba8110ad24ac65ee46ea01272766bb7f63089943