Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b885b595768b2d…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 02:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3e231607c3550e9f6e64da8b23703da SHA-1: 679a43870f79a1591fbcbe1e6e83083002aee953 SHA-256: 89b885b595768b2d6ed7e203b56c52d06614cbbfe1473a616c9c102ba2ebccba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=how+to+connect+iwatch+to+android
    • http://bibliotekaszamocin.pl/img/upload/files/xizukajokadavugi.pdf
    • http://theloanwala.com/userfiles/file/zinutusagu.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210901_FD6DC9BF57DC29B8.pdf
    • https://thepainter.asia/upload/files/1553002468.pdf
    • https://zmiz.hr/userfiles/file/77036743927.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59fba4cbb---35466168252.pdf
    • http://speed-r.com/js/upload/files/93990573349.pdf
    • https://webaprint.be/img/file/17195009821.pdf
    • http://domgr11.ru/uploads/files/80179083729.pdf
    • https://nileagriculturalindustries.com/file/5497107639.pdf
    • https://hunde-katzen.at/soubory/zatadixafezemixido.pdf
    • http://goldenpeak.it/userfiles/files/69394547243.pdf
    • https://masukpt1.com/contents/files/41423229808.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad8388d981---30778816399.pdf
    • https://dakhoathienhoa.net/images/files/77052065719.pdf
    • http://cungcapluonech.com/upload/files/zamogori.pdf
    • http://simpelms.nl/userfiles/files/kexube.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/jozavaragazodiwaliwibux.pdf
    • http://agataklimowska.pl/userfiles/file/30873996322.pdf
    • http://nessium.fr/userfiles/file/riwafomu.pdf
    • http://bon-mar.com/fck_user_files/file/kadusifexifepipewuninitet.pdf
    • http://cuuhoatudong.com/upload/files/6974052298.pdf
    • http://smenergy.kr/uploaded/file/6365432236132f3eaa2c99.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd641c7687---xonukaxet.pdf
    • http://redskap.ru/userfiles/file/kakajov.pdf
    • 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_off0000c4ed.bin
e328cdf2d48a71dd0acd55ba17a6dfbbcd6ade57cbc7cc0019c6d65430966609
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4ED 16560 bytes
font_01_sfnt_off0000ef35.bin
177b1d996e24d03cd3f2d33f0b184f9318b1782565fa21107e218fe477f17a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 10332 bytes
font_02_sfnt_off0001066f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes