Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcca3e24d49327bf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 09:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 556204bbc0843795b028e008572b171b SHA-1: 145d78e407a32ff1038a5e64d86ac74d9d72677f SHA-256: dcca3e24d49327bf62879cde806867877b5987e9d58d5cbb420fbc47955b8fee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to other malicious PDFs hosted on compromised websites, and employs a password-protected archive lure to evade gateway scanning. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdf In PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/64601889821.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16097d6d8b2740---zunorubid.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9938f15fcd---69986120680.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/negedasutatuxiditokaf.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/89229645828.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d992a27fff---70203449860.pdfIn PDF document text
    • http://webursitet.org/Files/file/kederinizinutin.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2283a781---tipipowuwamotafalo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b96a08fd---33459160933.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/10811141378.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lowoditelikakipigi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607364f7e05f0---giromilawemavudalax.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160920027ef57d---xilugotuzojor.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720cd4e1604---tefeparepokuvupoma.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210527165919.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfdj62aqg19cja2200j164db9b/64051446547.pdfIn PDF document text
    • http://gekon.net/userfiles/file/pelojenesexuner.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52f8bf117---nuzoputivejajumijumine.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca42c7b5b---fobaza.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/nq9s6rfh5htj0k8iltv40nkds5/terojexakib.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aduw.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/76247901181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=wondershare+pdf+editor+getintopcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16832 bytes
SHA-256: 8803f63361b65128d50ade34e2e6f86db89c30f1b544679d9ab11637431c98a9
font_01_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 10844 bytes
SHA-256: 4056dc64931fb500b1baee96264465277dc170350e88cab1c31b9156129d19e9
font_02_sfnt_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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