Malicious PDF — malware analysis report

Static analysis result for SHA-256 700d0953767dd127…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 02:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 153932352618f168a6fdda326b1f7829 SHA-1: e198b99a49af69d67589dc7f7d30794074529ef3 SHA-256: 700d0953767dd127a12a4f6032ee2c60b94accbc76065c6135c67ea4beaccc5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external domains, many of which are disposable and appear to be part of a link farm designed to host further malicious content. Several URLs point to compromised WordPress sites, indicating a technique to disguise malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=best+h+words PDF link annotation
    • http://zzps.pl/userfiles/file/47416732656.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rimuwegerijese.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c08844393a7ce0824371cd5119d3e494/83033365612.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lekagozenunorezuni.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/40623111260.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/letowarakarigaxupunupasuj.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/jawamigep.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/55508937811.pdfIn PDF document text
    • https://hgb.se/filer/file/vowasosigevudupa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f38258084c---lapukedu.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pezowatudileluk.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613bccbb37a95---17578599787.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/41902755088.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/21342008284.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/7435122204.pdfIn PDF document text
    • http://nemochem.cn/upload/files/kadesejopuvixerakerafufur.pdfIn PDF document text
    • http://moneymaker-gold.de/files/24755363419.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/desubewalanu.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/dikamumepaviveweretegese.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a783c1acebaaf2b8edd673228fd7b81a/57655533270.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/50331167475.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/381813258.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/51093067320.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/3058479230.pdfIn PDF document text
    • 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_off0000b6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 10080 bytes
SHA-256: 99a96f7ea28f167fd9a414346dd263f5bdf3788974963c91294702a110d94e92
font_02_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16452 bytes
SHA-256: ba7146804334c94bcdd51adfb5e9467d4bf019db21f367f58e010cd76b752c4a

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