Malicious PDF — malware analysis report

Static analysis result for SHA-256 2413e972e619f8a9…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 00:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b1a8788091c9411f12921ac7147a0a9 SHA-1: a7202a04cc2fdfa300adc6fa93ba5b7d5d87e641 SHA-256: 2413e972e619f8a915f633b56fce33740b552c9ceffcaa0d5423a63ba72de86d
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 multiple heuristics and an ML classifier, indicating it likely exploits a vulnerability or contains malicious links. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=hearts+and+hands+questions+and+answers+icse
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56aec2f5a---53936314613.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/019e8a8e4ed7ce679360309429c6abb2/57475350732.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/6723f086b0026808cfccc75bb587b33a/65333922894.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1f67821e6ed93f6ac000d5dea7f0/ranozujofofixito.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b04e58dab---wagosolagi.pdf
    • https://xn--b8qxb801j.tw/upload/files/petiruputitig.pdf
    • http://jjinline.org/file_upload/file/fezabakob.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c670b2157---56566069349.pdf
    • http://momsystem.ru/public/file/20015501569.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c7ce768b---pelosotugamalemo.pdf
    • http://cupta.org/userfiles/files/20210601125425.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ce7170140f8b64dd171bfe36e03c3a51/nixexijesuvufebofatibo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1a5f32b1---famaxosute.pdf
    • http://lapawan15.com/shop/fck_file/file/69951359483.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/708a32ea7a58fc4c4ffa9fb07914aaab/59291957166.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93619e6500249c78ac698a9d9e39fb10/pevibikarodita.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075b08eab2d6---dilowexojanogijumisijenud.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/442dffa9be55f6e0a396caac233a4edb/rofusabawuka.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/543bec2c0de99fb812b94d22dd52c3e6/galavorexesunidopejis.pdf
    • http://macabrey-luthier.fr/data/Files/56512294488.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf841ec71---wobexexikebifokolebite.pdf
    • https://clickkedai.com/userfiles/file/57974558135.pdf
    • http://unipsyclinic.com/userfiles/file/20210520233538.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609516caee170---77494275179.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_off0000e5e4.bin
5d01dad099fb96e8193230feeed450ffdb432d6a0374e76e1beb36e7d38352a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17348 bytes
font_01_sfnt_off00011222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
font_02_sfnt_off00012a39.bin
b4c0bc39d1fba895f9d5221f2ed33aa562841f881572aa82ec74eea914c32915		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 10744 bytes

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