Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a1f885cda1026…

MALICIOUS

PDF

99.5 KB Created: 2021-07-09 11:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad3d9e8f055c4b96febf2f82f05cdef9 SHA-1: 00dc6f628b3d52cef75e335b22d0af5f4e7142a4 SHA-256: 344a1f885cda102684b45dda3735e0b6d7ebc9aed25b2b78e242f5c73285fa98
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with several heuristics flagging them as potentially malicious link farms. One URI points directly to an IP address, and others are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba354b834---31478428715.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/4qd3ithr5qbbh7f03g2gsrjb7g/winafakupin.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/bulunonuwurorabaro.pdf
    • http://aryajob.com/user_upload/file/gerirejiv.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ab89c7bd3b9a4c4352bcd09b3d5f05f0/mokirukenozekaxidibaku.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/xamuwiwebabo.pdf
    • http://box8websites.com/ckfinder/userfiles/files/36093511475.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc82d35b2---33993765441.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/d70p1vdptmogju7fmj7sr0t9kg/gadigux.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b40eea84---85586162755.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529223851734864.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/jevarujateju.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a5ac384b---55748836655.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e9f311d1---jexiworadunogezo.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/696637a18d7fe6e2cb330ba88fd39fed/43307973492.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l1sack2ahq4ifo4947et8hg156/51506385800.pdf
    • https://girl0229960192.com/upload/users/files/danenubutunofasudupenozuv.pdf
    • http://ankurgroups.com/userfiles/file/25440429607.pdf
    • http://chupanhnoithat.vn/upload/files/dukujopowomebisilogu.pdf
    • https://hyundainhapkhau.vn/upload/files/pirifubetonajad.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5f2447bbcc350100b867e21852b55cbf/77811608767.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ef87264d8046cb813d96ef9f5c0bedc0/12156760979.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6slhob8hhike8rjjhivf1fb1kt/wovuzugotuwenuxedev.pdf
    • https://parc-hotel.info/file/44225384872.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jetty+park+rv+park+reservation
    • 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_off00012378.bin
d51bbf297b4841199d8cce790348fc13a831cf3a3d51132e9d0895febe181705
pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 17272 bytes
font_01_sfnt_off0001509b.bin
0c50cbad8f3421ab6d671087c649ad68c596d6a0c60685520d701f6cc42a62cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1509B 10460 bytes
font_02_sfnt_off00016895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16895 16792 bytes