Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aaa454045f63503…

MALICIOUS

PDF

92.8 KB Created: 2021-07-02 20:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 386e519e3e8342286038caa8e5f53c6e SHA-1: 42f916c884717548ace282e47b511856cbd5a2bf SHA-256: 0aaa454045f6350339dda4bb0ae2d53abe39eec8ed7da7b9e310a544bff8fd1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. These links point to other PDF files, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the delivery of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=plant+physiology+mcq+question+bank+pdf
    • http://cc-loges.com/uploads/file/popusotuzalazejokazo.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609440c4105ab---jaromomudulutelizofo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0553d863---59927619333.pdf
    • https://telewebmarketing.com/FCKeditor/file/lalujoxifizegajufalejefud.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9005cebf---tepipezi.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eee5b8771f---30353246740.pdf
    • http://cloverpark1959.com/clients/51168/File/fijapuduwoditozopemoke.pdf
    • https://coluer.ir/documents/file/gedozig.pdf
    • http://sotel-perm.ru/site/file/83909994609.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791b7d65145---doguzeroxil.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/38327b563387745b1b0f9da31b8d665a/18792288246.pdf
    • http://beerskiboot.com/img/upload/file/2597296556.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/74b81398e3adca5945cf8d59f0ece70d/44912427694.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a3464b66---70707974159.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b5c26bb0---70615229348.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2a2dffa0---58786894891.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ivmst5jmengc5r5fi7ftgor2h7/tigomiramelinaribegusom.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/gonoveragariminosate.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0qrmc9ns4v3bo4t9g16cbhvvp1/gisofiro.pdf
    • http://devison-matras.com/upload/file/wavogefu.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7ris0a623uqdse5sfll68ab0fc/newibejefivuga.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c0c90303a---14365185878.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/110pk3h2vpo9j6leh69fga1h08/32994439342.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/b4ebaec1227882600845aa6e2e548a75/56060673505.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16088 bytes
font_01_sfnt_off00010490.bin
5767012ca309821fed54050f7253c1c7122a9a691b21172e7ec98b1368bde7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 17484 bytes
font_02_sfnt_off0001329b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes
font_03_sfnt_off00014ab2.bin
3b36842a26a8057c16cb2f674b48f1f0b21bf0d35510df3f58ebc030f5f7653b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB2 11560 bytes

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