Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdda8e0afce716f8…

MALICIOUS

PDF

104.1 KB Created: 2021-07-02 15:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27a1fa9530452ff82095034e82684e25 SHA-1: 9ff65ec0a4b11bed4fa27e253331c5a26278e184 SHA-256: fdda8e0afce716f850202a2a3164f943a55c7e40a5b3345b6d2ae032aa048c8c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves redirecting users through these compromised sites, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

Heuristics 6

  • 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 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/56d55mtij2orp5gnvhdmq0fq89/45335542212.pdf
    • http://nsdadventist.org/FCKData/file/dulolajapoderefi.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b374bbd910b---91869087374.pdf
    • http://aitrans.org/UploadFile/file/F1202105121051182775.pdf
    • http://dancephoto.ru/userfiles/files/18702455176.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dab99eee---8426271782.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/mizuworus.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b3754c64a5c52342b4b5cdb71fd899dd/4700628851.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/49359796225.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076057065796---95718491106.pdf
    • http://ahlhy.com/uploads/file/040810516397.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094181d36db8---70626674588.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0e284814055ec2612636d346a547a875/mubazexewedozadejedabe.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kbg429tqbas226eegg754b1r5l/lizabozu.pdf
    • http://3qbuy.com/CKEdit/upload/files/51420429005.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb6f35ef70---dexoxedaxubogiwinad.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b3a4bbf2a---roreg.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d37a9cd79---59695817776.pdf
    • http://mariopresto.pl/userfiles/file/koledidikozeximatex.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/163964629.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160999944020d5---sidasuwenexutan.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0c35d7cbdf149a66642619a36381a5f3/72086755832.pdf
    • http://patp1ryb.ru/media/file/11610761635.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d8eff2843---mazufagibebokozuxiloxupo.pdf
    • http://littlepearlspublishing.in/data/eimages/file/sunobatigulefuzezesu.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0g0aov5gekt35bs1f65g6sbf74/20635209109.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=holiday+city+toms+river+nj
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015cd4.bin
68679709210a13be05deda384503204960e4d0f8748d3515020bdbf8f750d1f0
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15CD4 17632 bytes
font_00_sfnt_off000116b7.bin
77538acf4ef01676e39aa737888277528d3480a96a91f8f1eebb45d9188af20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 17604 bytes
font_01_sfnt_off000144c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144C3 16792 bytes
font_03_sfnt_off000177ff.bin
5fe6ad2519ec33b08cb39281a20051e8c5be95a4241a622c050c28c5ebbd548c
pdf-font-stream PDF embedded font (sfnt) at offset 0x177FF 10832 bytes