Malicious PDF — malware analysis report

Static analysis result for SHA-256 f784f7eabe2f2c66…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 02:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6be111fab67c615229e94d1d8a937355 SHA-1: 730ecdd117bf3ed546fe6b196eb2ae547c34e68c SHA-256: f784f7eabe2f2c66a08261d3852585f32dc10e6a6823525bd80331b980ffcd23
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Some of these URLs lead to compromised CMS uploads or disposable hosting, indicating a likely attempt to distribute phishing content or further malware. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://rijst.nu/userfiles/file/80283711537.pdf In PDF document text
    • http://gensugroup.com/upload/files/57075908255.pdfIn PDF document text
    • http://selidbe-beograd.info/files/roxada.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/26518724868.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1f3f35f6f16f928f89e02852d4bc54f6/70369254566.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e845b3c23---namuruwuralazodin.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/89077935439.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/tupukoj.pdfIn PDF document text
    • http://hexindechem.com/upload/files/84775905987.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/batixixuz.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bibivuposojo.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/15709595677.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/38357602768.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148631b76cd9---37612736259.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/87750900276.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/14574605793.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/8856247901.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30293262951.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pob3oosfo04ouprnmsnc3rilp7/lifozuwoduvoluzojajowozeb.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/34343435681.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/vexagavedogevigozer.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/rapefoxukebibuwatul.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/83845123644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rust+and+bone+full+movie+online+free+english+subtitlesPDF 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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 16976 bytes
SHA-256: 1aca8818c1294b4ca5340810343b6cbd7bef9af6794bc41b2a2a78a8a10bbf11
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 11152 bytes
SHA-256: f42c06e46c6f7fd8686c8f729f2736d1fb666e4b0e66d1d6517e469c972d68cd

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