Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f65b288cc3cee9b…

MALICIOUS

PDF

90.7 KB Created: 2021-09-06 00:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b893719596145c477a704038b2bf5d59 SHA-1: 9a888e2f2996833f92e54741d6f8043dea6410c4 SHA-256: 2f65b288cc3cee9baa88f7f4e82b4f4bbe41d6a6f41e491946a4980ad1d66301
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting sites. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the ultimate destination or to leverage a large number of domains for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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 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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75689969231.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727e0d06a73---paxirazapebizu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/zasukexemalu.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_024253.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/22828816970.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/69232258893.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/75190095370.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf2a5b4d---63289572287.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc36b09ca---zetufeku.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16123bfd2662ab---fubiveve.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/61092267242.pdfIn PDF document text
    • https://aneri12.cz/res/file/14509725148.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/losepemexezapafibamiro.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481414483f---17546413127.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4413dc1b---fisogowidigudidugazejago.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/refuruni.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/28159690829.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/nafafutejis.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d1038d760fbc8a1f733136a4c31db3f9/jukug.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/68492111286.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4b81f8b2b022c1c65d4e92b73021680c/bolavirubu.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/kujatuxebovupepoderus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=perishable+cargo+regulations+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 11140 bytes
SHA-256: 8ec472f0599edaaa0b3e34692288ae38965de71a83e009dc48a6323adef32d33
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 24464 bytes
SHA-256: 3e4e073175f7b0aef55ef43ee27081d1f3b83435209552a36676069bdddc90f6
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AA 16252 bytes
SHA-256: 280241caf773ea3979d2ffcc837fd60d6811f053544fade439bd4eb91b379dd8

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