Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0786c72f5de84…

MALICIOUS

PDF

76.4 KB Created: 2021-07-15 19:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75111e0e5375f5cb32eedf2bf73ae019 SHA-1: 645e795d2aef6f0364391a704893066ef6f8a32f SHA-256: edb0786c72f5de842bcf91a14df5f2c26260750847bdf22ab5cdd2132fc1a940
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://szyldkj.com/luodan/images/userfiles/file/18533864804.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9a0c48994bbb978d1b8dfab4c97c5585/dafibulanapaja.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02ef67932f---watezo.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/2d104677fa412ea9acd1aa422355f499/84845171788.pdf
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/56660233483.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/bfeee63f50923daf9100123adc7a3ceb/kidinidulabib.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d7fb090e898cef143864ba143162d085/89282150420.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6b464309be749dcb1103433b3898037a/88498537790.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/75705fad46c16f989cc457fbedf57f6c/34994048453.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16071f47fddbea---37074333593.pdf
    • https://kibledergisi.net/resimler/files/22714332515.pdf
    • http://nakajima-ya.com/upload/save_image/files/wajagugusa.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a374f2beef7636c3a8eed9360ea93da8/suwipujuwixufuweduju.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/opmuo95erpflkn45n4qvq92058/31955597302.pdf
    • http://stellamaris.cz/userfiles/jokujixuguridibizive.pdf
    • http://iphysiology.ru/upload/96908961916.pdf
    • http://princeverma.in/uploads/files/funesazagiboxume.pdf
    • http://ya-ke.cn/admin/upload/toxevonesomuwirunevatudu.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8be477920c6a581f6833d6825db5c570/786413026.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/jatotapekiniga.pdf
    • http://hicoweld.com/shop/fck_file/file/fejesifedumavirox.pdf
    • https://aaaxxion.info/images/file/67121257415.pdf
    • http://sxhk365.com/uploads/file///kujiwazenupivutogutozanam.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983877334f6---41905100007.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=brontosaurus+colouring+pages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6a6.bin
fde0a10821d5c658be5a8861b5a6f5f8750fd694e5bb79e8baed4d728aacb5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 10704 bytes
font_01_sfnt_off0000df66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16792 bytes
font_02_sfnt_off0000f778.bin
79207e8883b6261f902a9266390fa32d9e9d6e9f6f6d4b8f7d3d9fd85feaa323
pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16692 bytes