Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358478a7dbc7383…

MALICIOUS

PDF

95.8 KB Created: 2021-07-29 16:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30aa4c7f91fbbabb231db838b7dc6218 SHA-1: ba8121117a51ec4b99c973ba08497ba9907bd15d SHA-256: 2358478a7dbc73833c64a618baf867e3b38133eebd4cb7c62abbfc43cc913919
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc26909201---xutisolodetibidiwevav.pdf In PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/wibolis.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/divomifubitomir.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5687a8345a---jafisalasafizeji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9e32432b32114018f299a55e08af6ecb/lireze.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/dodobidabefadofapomivexa.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfac9b618e---gagupe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b813dde0f---69043026755.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/legimepomoxulam.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d6fc52a9f1dad6ebd1ee649ea56e5bfa/6421294159.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7891ee3faba788fbb6f249d9722a176d/nenet.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/takesupuzopavibanaseroz.pdfIn PDF document text
    • http://yejida.com/userfiles/file/8160979008.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/2760481881.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/jumamepuxep.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/45f7c1ec826cfa5f833c29ed5559271a/noritafab.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19089bcb4a---64874497890.pdfIn PDF document text
    • https://spark-care.com/userfiles/file/49371266403.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d1f5ab0189a38e9a03a25a10ac382b43/mulizegugedebeneromi.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/54756088688.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vibinana.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lofafovubepomikuz.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/41578357318.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/87budvth879maddi7i1fi0o8m1/wezanawuseka.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ced826d7e17---26204408398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=los+puentes+de+madison+county+libro+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_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 18284 bytes
SHA-256: dabd935a59fd5fe312144a04d20eb0d04f59f539e64a0883c2d6275919da2208
font_01_sfnt_off00013e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 11092 bytes
SHA-256: fa51223173b09e7610417253bc1dd4fbce1d4b6076ec386373bdd9a8b1e88061
font_02_sfnt_off000157ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1