Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5401f3607240bd8…

MALICIOUS

PDF

90.0 KB Created: 2021-07-01 15:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abdd05dd52aeae44ca718e4a4ac11996 SHA-1: 0ba7ae8bd95e25ee88a7a36e8db45ceece17c8fb SHA-256: e5401f3607240bd8b28d34d31ec8dd0106349160bbca398f60d6c4a769536aba
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not directly reveal the final payload, but the overall structure points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/vadavazemami.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8ca6f133---46167975746.pdf
    • http://oio.cn/uploadfiles/files/gaxigewojujupudop.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/i8sjmtfesa433pl4d2ft7pjk4n/99986417373.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5b713f7c---4500899348.pdf
    • https://ctsgroups.asia/images/file/jozizuvatejirerep.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074304dee671---pivesezapugekesawesarivid.pdf
    • http://silesiacapital.eu/data/file/papibagepowixo.pdf
    • https://briljant-maleri.se/UserFiles/files/wuzaduvaturitulemifopowo.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qi6bvpi7kf0q65tjp392urpumt/tolokonilinoperited.pdf
    • https://maisonforville.be/documents/file/2299726692.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/81640750010.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a71a0m14hoo2sq06k5givlq5ja/juxepujiside.pdf
    • http://sanarina.de/ckfinder/userfiles/files/15029714185.pdf
    • http://gardatrans.com/content/Files/mujugotifaseliwedugora.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/bba211d0bcc585a8b9872a1504cdae52/26933714947.pdf
    • http://mientaytourist.com/uploads/files/68388550239.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/b1a6d903e40e2f080762efc1c991812b/newugib.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/40041cf315040d01903d584a5eb252aa/61906380971.pdf
    • http://bryanhigh78.com/clients/72554/File/diwiwizibisus.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210630031514.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96ba575e2---10042475591.pdf
    • http://oldtimerclub-thueringerberg.at/images/file/30303267567.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090946fdc8ac---vumetenidupunafu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/12m298lr9oujge2knsisd2a4t8/41026332854.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=no+red+meat
    • 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_off00010159.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 16792 bytes
font_01_sfnt_off0001196f.bin
a0bca835f0300f8ed99e73a2f9ae49f9fb7ca982e504a84b521c9a06a8dedf34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 9976 bytes
font_02_sfnt_off00012f8b.bin
afc695090ab1e549d0142d8207730033af4bdd2929b326fbaf3dfe33885d52ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 16600 bytes