Malicious PDF — malware analysis report

Static analysis result for SHA-256 103d05f6781b04d2…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 14:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 290610e2c2342b63f103dd1da475b33b SHA-1: 7f3eea9c725fa72da4a00dc3f96f630b8c923416 SHA-256: 103d05f6781b04d23a3c8c5ee7d889972f3a196b2d81398e476d42792ce7e162
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains flagged as compromised or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, so the primary attack vector appears to be social engineering via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://immobilieninvestors.de/userfiles/file/33919081867.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f20c6cf9---mobejubepipeboguzem.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/vadejasumu.pdfIn PDF document text
    • http://mrybalko.ru/files/52476634988.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/xivezepifoxodajiti.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kesije.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/10c432b87bbdbe0ce906e5711e3c9e9a/19803170923.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/revoxuvasukabasig.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/80421639571.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/koxebuluw.pdfIn PDF document text
    • https://upaspor.com/resimler/files/tesegel.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/16372291851.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/nirupividuvokewuxirikive.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/duzabanadefomiwekotanas.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/49863112452.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/9720863888.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/12699683159.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/vebebejobamatuj.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace768d7db---jinededupovojegugazexi.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/fotafe.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/mifijexezal.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/miwesufexapugowofipo.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/98055200203.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/62657449271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+transfer+files+from+laptop+to+mobile+without+usbPDF 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 10940 bytes
SHA-256: de5c7398fbeef302c313a26b0aa994a40a6069d253793b7a78ddce095ab64ac9
font_01_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 18348 bytes
SHA-256: ab2492920328be66fd8f3dd127f99867ba3da3432ae7889c008ff29aa38a5c6b
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1