Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6a95209f0a4e42…

MALICIOUS

PDF

90.2 KB Created: 2021-07-28 01:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78cd205ebf43f544e83ce36380a1aa77 SHA-1: a4ee89b5c6034791b420bece731e3b94665004f8 SHA-256: bb6a95209f0a4e427631b1eb087ac4f71644bbe6df969f572ef7b5465fe08f29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users into downloading further malicious content. The PDF itself appears to be a shell, with no meaningful document body content, further supporting its role as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://webmenuplus.com/images/file/3192791217.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caebc6664b---77040009110.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/49581609382.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/43274677432.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/68401736233.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/9865361949.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b034a6ae4c7---xodebutomibor.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9563f629e3---getapavuwipipur.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8eb41805f---wufunaxika.pdfIn PDF document text
    • https://soechi.id/userfiles/file/zajebokuvowukomixikexasu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a6dadebdaa21f9e3ad6e3a83327894/lefizidanuviz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054b746f30---53318702976.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/21279799488.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/38031a18e8e056bee5d4208347835676/fumujimijamepag.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2a5d1f487---puwoxeji.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/67348162886.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rejesufob.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/bodazifedefusoxukoluf.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/78151090843.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mejegupal.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/gezikivavevaradut.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/wapinotewavegexo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e678b2eae---23336998857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+video+call+app+for+android+and+iphonePDF 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_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 10836 bytes
SHA-256: 10c055cfab478e5d785c55fce9d01a267927f4ddd26a8ad455e4ee25b9c104f6
font_02_sfnt_off00012bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD4 17424 bytes
SHA-256: 622c8263343bf7ddb727f4f9e55557cceb5aeb84a0c049788a83ffeebbfe536a

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