Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa058d427bd24cc…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 17:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 231e9b7b8138cf1a02ff9877f2ff939c SHA-1: 0f9cc214ae235e79ee5e350766a31cb94c192d15 SHA-256: 9fa058d427bd24ccd6bb93a26757f6b5875737799a79ae564332675f0402f488
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, while some are confirmed benign, others point to unknown or potentially compromised domains, reinforcing the malicious nature.

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://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/9t9q3gr299uia134o1010jngnv/68230741358.pdf
    • https://vannordenvastgoed.nl/userfiles/file/wabumalesodudox.pdf
    • http://pho32shabu.com/uploads/files/jiwibibanepu.pdf
    • https://kham.vn/userfiles/file/2367825626.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bc9ba0ffe57cf93f797544c09a92f255/vamugebodu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h1jbjp9dk3ec2j74haer1rugmc/8942128473.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd5b66edd---vebamikokazanakenenar.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648321770a---16329619040.pdf
    • http://zovsh.com/Uploadfiles/files/54983583581.pdf
    • http://www.abcklima.hu//data/editorfile/84767699723.pdf
    • http://akinmedikal.com/uploads/file/99525897637.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c3bd445---nanusedopawepidosepoker.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9502c7e97a44aa97c49febcf224cfc23/foxejafusawomefewi.pdf
    • http://toonesk.com/upload/mopabutozogepupinurul.pdf
    • http://lyshiying.com/d/files/93290236028.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ad46c42d3772c4f5a75d80f15df92da1/dexisudojutadamufi.pdf
    • http://acecaalcoy.com/userfiles/file/bodujogekopabepositus.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6f4c710272b35131d43739a63a9b4b93/kowadovobalupigazater.pdf
    • http://archerelectricsupply.com/userfiles/file/jajefajud.pdf
    • http://phatnang.com/media/ftp/file/pobemamedosu.pdf
    • http://namngonviet.vn/user-/files/welepudinilulobisu.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/4656418709.pdf
    • http://shipsupply.ru/userfiles/files/jojel.pdf
    • http://giasuminhtam.com/Images_upload/files/sixofuganilinas.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/7n9ed6m6dq5cmqbj70gcuosv40/zuzowadezur.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/wujovogigurumewapere.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cute+updo+hairstyles+for+work
    • 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_off0000f6a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
font_01_sfnt_off00010eba.bin
0a6b342ba039adc2fd1829d06c246374ba0567a6ee5f4b5d4aa409f3a790982a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 10912 bytes
font_02_sfnt_off00012841.bin
1298b2514b758051c3c45973aca86f8d9ebb0ed3627587db4362cfdb1a5ca4a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16880 bytes