Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d71a8a4d8e68280…

MALICIOUS

PDF

73.5 KB Created: 2021-09-14 13:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f99846640a7375df7bcd14c02fe874b SHA-1: d7903dc91a2c60edcd71018c2513a702822e1e1f SHA-256: 1d71a8a4d8e68280037dc146fe92458cda7a92c38d58d3bc17d2bb03f8383d8c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, such as http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dae0ee41---xozukudesitegomi.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://seghers.kr/data/editor/file/44051400761380fce93a20.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/051d67205e5bbb9480b36c73030c496a/pusixopu.pdf
    • https://apsco.ly/userfiles/files/81417647142.pdf
    • http://synhbio.com/upload/files/gusojivofinifigazo.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/pobevamekipikuriwirara.pdf
    • https://benhgout.net/uploads/Files/file/12252646301.pdf
    • https://songhong-thudo.com/img/files/67046085871.pdf
    • http://ecohost.ru/pics/images/file/5693591214.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c458fe9a0d---87724150242.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/texopofaxogibuj.pdf
    • http://biondiairsystem.it/userfiles/files/varaselagobevomenirekado.pdf
    • http://elsekmont.eu/userfiles/file/valuzenavaze.pdf
    • http://uchid.com/uploads/file/rebotutapunanud.pdf
    • https://cyklo-wellness-penzion-palice.cz/content/54312466399.pdf
    • http://www.hgekc.com/media/userfiles/file/16238446667.pdf
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50505779143.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/5718505287.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/rogazawazipe.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/kisixup.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e599517878---kosipamaleturefebola.pdf
    • http://stonepigments.com/userfiles/file/pidaxepinemogupig.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2dae0ee41---xozukudesitegomi.pdf
    • https://cnn-logistics.com/asset/files/mokuxanomojew.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=demon+slayer+the+movie+watch+online
    • 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_off0000ba07.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA07 16792 bytes
font_01_sfnt_off0000d21e.bin
fef85cdcc63a8d8715d126ba707f6a62d785b89a7936a336f7eb7a51b0523b63
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 10764 bytes
font_02_sfnt_off0000eac4.bin
90348c4b1b75d39f714af02a0ed6bfba9acf91d98d7ede46e725785e40779cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 17772 bytes