Malicious PDF — malware analysis report

Static analysis result for SHA-256 828bb2a48f24f3ae…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 08:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ea1b4de50bb5096bb1d199a742ddbd8 SHA-1: 130e5e3a295b3073757886494790b2c07a175d87 SHA-256: 828bb2a48f24f3ae36990dcb230720fa0d87d486d74425094e4cb79675e30ce6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files hosted on compromised sites indicates a clear intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44991eb5c4---guzadoxabajatararisamew.pdf In PDF document text
    • http://sibmetiz.ru/upload_picture/72482223843.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4eb34a9a---gefiduwogiwulateb.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/79249235704.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d02c9c3be2d---vorexawes.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4uag63j91i13217nd0lm5f4vp4/4167283652.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/5051457797.pdfIn PDF document text
    • https://digireg.sk/upload/fonegunovaduromil.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6dd74a78---64430717840.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/31143040812.pdfIn PDF document text
    • https://invest.pl/userfiles/file/9168741396.pdfIn PDF document text
    • http://yuhongzg.com/d/files/tesitozewapenet.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/lojonapaforetebitaf.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e59e80aa5e01e72cb5b9145f92d592a2/woritokovumigin.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b0cdd8abb---67320126163.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/uutn5lopq85ak2ed568ngeu8a0/68572947794.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ba276554c7788ec5a3a9c276fc4b0b32/40619674269.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/poladukog.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ce2dc2ca---pojuwojek.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021725433194633.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/wamobapu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea8f3d98fd---85880583256.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/negofenemasovugijadiwa.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/nuvozupitososotusu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/88815247402.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/1012740726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=metric+thread+chart+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DE 16968 bytes
SHA-256: 69ec2c2747faecdd659a1d60f37ff1288edc4f519b44fecb6608d8d0d97bfe09
font_02_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 10272 bytes
SHA-256: dece6e51d7ffc672ca654ff6c14df53948369602e25308c776e3b7cdc0ebd609