Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81776d30d4d3c9…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ad9a8bb62b92e402a27f5e4e277b7fa SHA-1: 6ec91a1f9d341302b0d5b01205f2cbfdc5c97b24 SHA-256: fc81776d30d4d3c90411bbc07e02987ac12ac0b4a9d8824f6fb6d5de9bdac2bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially malicious sites. The file's structure and the presence of multiple external links suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a0d34d033db02ad83856bb85bedde721/guzud.pdf
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/vudise.pdf
    • http://aeronautike.com/userfiles/file/pepimotutabinej.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/29620701121.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/3404630605.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9b79d0964598537860d47d803cff2f29/97608352242.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/31250f89fb8585b0ed8efd54905d57bd/reginetazadukibamibu.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5176042a0---xavitejegobepivu.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/2570546865.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ee78c8c5fb9bf5844c7fa8325c91e0a5/xunux.pdf
    • http://diysmart.net/userfiles/file/zasutuladapixetelo.pdf
    • https://golf-tout-terrain.com/publish/page/file/fagesasazifeguju.pdf
    • https://arerp.kr/data/file///79610193822.pdf
    • http://jrpst.pl/userfiles/file/99866946837.pdf
    • http://alliance-ltd.com/userfiles/doxumebumawasoxodul.pdf
    • http://mynigaoe.com/upload/file/20210610002751.pdf
    • http://elsekmont.eu/userfiles/file/magilo.pdf
    • http://tw-sincere.com/upfiles/editor/files/duwetowukabulelutonura.pdf
    • https://penal-garazh.ru/files/94070106773.pdf
    • http://animalscipublisher.com/files/upfiles/file/dezisamuno.pdf
    • http://fashioneducation.ru/userfiles/file/43494520076.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00765b2a3---35921270381.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/19607845063.pdf
    • http://abwbaltimore.com/uploads/files/48868893162.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+10+snowiest+places+in+the+world
    • 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_off0001041c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
font_01_sfnt_off00011c33.bin
29ebbda391206556db6ccf1f858bca3fb89753728eb4b436c7828409641a673b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10832 bytes
font_02_sfnt_off0001353c.bin
c04b4042eeeea5ab7b5f73edebdd600143357bb02d6bfd96228854de47901d56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 16612 bytes