Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9691d79eed024f…

MALICIOUS

PDF

93.6 KB Created: 2021-09-01 01:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91f8f05d18c384f8bdf9cbbc757b4f05 SHA-1: ac211fa72c49ccf0c436fa22c383b4edd8b29d79 SHA-256: cf9691d79eed024fa45a004375be89515ccf8a3d0778fc0d9ff01dc8818a001d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=stock confirmation letter format' in one URL suggests a lure to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://szerecsen.hu/editor_up/97482505840.pdf In PDF document text
    • https://rafaela-motores.com/userfiles/file/41781630811.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/97597323017.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/262295ef235b8e42239ac9c5fd646a28/28763118459.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/413f89a021dfe7939fd4f2db92ce2e74/1552887730.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc99e462ac6---zukumokojadujomudoraj.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/760a4ad942cc810c54ed0a5da969ca28/29323438045.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612189d8802d4---xoxedineferiragafejaloz.pdfIn PDF document text
    • http://mdtrend.hu/files/file/soxenotuvorovuk.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a50d9ec72447f3485cde90beb7c8e49e/zixisovozowaru.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b61b30bf---gutotonutedidi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/529bdbc1c3c484a25ee767c1a840fbfa/voxugufisowodiwuv.pdfIn PDF document text
    • http://huiking.cn/uploads/file/160201501791.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/14787905350.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4daf4d5f2---74180326742.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lefiraluzafugag.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94ef73ab1---bozofowatebawiwabure.pdfIn PDF document text
    • http://willbramephotography.com/8399768422.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e6bd84bbac4ab46048d8394389f50ec0/16424937805.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/20161932635.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a90aa4444c1efc48a29b2dbb48c73649/vodogobidemuseketado.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ivv3bqicfrvdtg3moufb0p7p04/mojalomogifuguwejudujeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=stock+confirmation+letter+formatPDF 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_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10496 bytes
SHA-256: a98b881e2ddca9cb5d240ccf2c2e33ff83072fb04af1fb2fd312fbfc8fe15f6c
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389D 17884 bytes
SHA-256: 1a6db3720187943fd58ba90f7a9c6ef8b644be74c31ee7fbb3e7a0d42e9f8bbc

Open this report in the interactive analyzer, or submit your own file for analysis.