Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e9b71393f70697…

MALICIOUS

PDF

87.6 KB Created: 2021-08-17 21:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54aad4208446f0777bc5956bb99c6e99 SHA-1: 50fdcb316c7d77bbd400722c7d709ed40e306bcc SHA-256: 75e9b71393f7069721aedcfaad5ce8489098b71c94051e410064190ee856ea0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains an embedded JavaScript stream and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=como+saber+seu+orix%C3%A1+na+umbanda
    • http://eltdb.com/UserFiles/files/veveginorarodopijetaz.pdf
    • https://mimpiindahsatu.com/contents//files/81199542122.pdf
    • http://romengo.com/ckfinder/userfiles/files/41612380344.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa17bd679cf---30899977360.pdf
    • http://polyalpan.hu/_user/file/pibosokep.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v6jb9jmgnf1l000faj08q9jv58/wigaguwuximetikoberuvi.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/db920c7d24226caa76c0d1462d71b4cb/zudulomatawuxusinazeboma.pdf
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/97332485325.pdf
    • http://unityproductions.com/upload/files/novorejupadasudatu.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/1b40qaqggl2vifmn1o5i0i3mnl/barapiraxubo.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80bb4a2b2---44909388506.pdf
    • http://cortabellanews.com/userimages/vitogupumagexej.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/42066162600.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b1dbdcf4---witejogajilu.pdf
    • https://estoniapools.com/contents//files/gudod.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/90mruareljihnscaqgls5c7io5/52156931016.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e550e3bc4---24620264974.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/fekamowogagamexosofoj.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hqhi4jfb6m8j2d67v275ngalp7/popifegolusigifizega.pdf
    • https://samowar.me/upload/file/16535654543.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b8a30e91b7cd6d1f3314c127e46df75b/46652767246.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b733351d701---83524972596.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0c945eebc---gafonemeribifavev.pdf
    • http://anchor-m.com/js/upload/files/51310411216.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bc395f3f---noxopaxebigusuwanig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed1.bin
b398994e3d454ebd50443971f9a86d6364f3d32983d64ff9d37430b1ca3a3fa6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 19672 bytes
font_01_sfnt_off00011e10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 16792 bytes
font_02_sfnt_off00013627.bin
7add3ff1b64deb6be7673e730bc2d903f3f0f13d92cb073ed27b0ed5089c704d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 10820 bytes