Malicious PDF — malware analysis report

Static analysis result for SHA-256 55662c9d820d008a…

MALICIOUS

PDF

98.7 KB Created: 2021-07-02 07:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 665fdf4eb3fb87a1d5f048471a1a1c53 SHA-1: 7897cf015ff8d42cb1795b101f6e1b90afa61256 SHA-256: 55662c9d820d008a9eb8ff0c9393a427023decdc7e0a1873d144d5261683f96f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links aligns with a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

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://smidgel.ru/uplcv?utm_term=shoddy+meaning+in+tamil
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a22cf15f---57784983947.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6122ff4001---42838107554.pdf
    • http://antifftech.com/uploadfile/file///2021062517050096.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f08b1e42---70646319895.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/949lm1ld1172sv9aablhp4ohbt/58387990706.pdf
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbb8e5896---96565824397.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b936694fa0f---60828968751.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6c0081cb---34476175006.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ba9a5dda---28765693014.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/210488e873b1a6dc9b2828ccfcc82b14/nigezelutopifedazadot.pdf
    • https://acavacecio.it/userfiles/files/98217336704.pdf
    • http://altelaw.com/uploads/image/file/xixegenajilije.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/39b825d591aea1b29f4b09f6eed3dc30/14194653155.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37958c15ca---lofufelovurovosoxejabomos.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabec1c174c---paxiremokozexi.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16080434521edb---63636070431.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607236b701f2d---5454846766.pdf
    • https://mosallaesf.ir/uploads/ck/files/47847441872.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609220017b6f4---85299425393.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503062018217808.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f5c56fdf---zabimikaxa.pdf
    • http://snsi.jp/image/news_file/bimofadi.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adac0bb82ba---safakukozigepifaxor.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b199b1633---jivonamaruneme.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d2542edad---38754255845.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1ba5d8d3b---jademomedopuro.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015b94.bin
eaa7d43b7f6963af3b74688d9962f28cbfba29ed179bb174234bec609133c962		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B94 18992 bytes
font_00_sfnt_off0000db4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
font_01_sfnt_off0000f35f.bin
bbadc805fe7fe1096630bbdc00a7128f7a8812a76b10300c87a6bc792ac3d9f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 25580 bytes
font_02_sfnt_off0001307f.bin
353ae1c7c881da177c0df53b568e5ad4666092feead25609fded75fb87054f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 5348 bytes
font_03_sfnt_off000143af.bin
b7fcd2eca8b00fe3d5e03db4caba138fba404295c7bce8a3d8b96f1b16b5b0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AF 10616 bytes

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