Malicious PDF — malware analysis report

Static analysis result for SHA-256 01788e0fb3a33d39…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 08:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32d7f028739f054cdc05383d379a9ca SHA-1: 0496a4b467858063419b6263846c2a6e10e4f561 SHA-256: 01788e0fb3a33d397e5ce509cbdbbf7003bcc98dfe8deef1c2d642c72ea33c3e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb3e6d3cc---97522882926.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8031d649---46078489771.pdf
    • https://penal-garazh.ru/files/ledokaju.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f3675d99d42dbcf39c8479566f2ca662/86246613962.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ece6f7f2---61789802766.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8ab40673c1da2106d48b379728aae3aa/lubipalodizisa.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0oood7atp36qk536m63d7odmdt/42155142588.pdf
    • http://clarksville.net/wysiwygfiles/file/vujegokabad.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dvpk85ha91abtcn4lcmkv022e7/50502497580.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sqkafmose5i39tc66o7d8nl4o1/88957477334.pdf
    • https://medtek.vn/storage/file/17988952540.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac8ccb408---85423679244.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/r9mbtlqi0snfl42v68vq994ss7/jemogujewor.pdf
    • https://eseninternational.com/uploads/files/96184692344.pdf
    • https://vildmarksjagt.dk/userfiles/file/26980668236.pdf
    • https://asi-filter.pl/files/file/16172078640.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ff9675f43---81725352643.pdf
    • https://audit-advisers.com/userfiles/file/retar.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b41492cd3---49085897451.pdf
    • http://allaboutdowney.com/userimages/bonumapowosasa.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6164d2cb6c2bd6eb123322c47461793e/tagobalonajuvetekugemod.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/36898c84560c2f3a60bd1a7f7f05ebfd/sifatolepapigepi.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491de90f2e---4515563110.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707a1281dbd---74925908090.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/kopemanapelu.pdf
    • http://spalovnachemolak.sk/userfiles/file/82548568755.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=homemade+ice+defroster
    • 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_off0000f453.bin
132ed63fe9bc49c39836bddd4d1e33198b9783de6498fa533fc94e7562a05286
pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17908 bytes
font_01_sfnt_off00012294.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
font_02_sfnt_off00013aab.bin
1141d3205cf17d549010012d54026a980aade40e512635f24f768168a60bc4fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAB 10480 bytes