Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c4e61644f9a5cc…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 01:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7afd75c6fcf5346d41daf3ae260fb77 SHA-1: 09469d447bc6b7645eb3961c02076cb2f217f26c SHA-256: 92c4e61644f9a5cc890c7a1a7d49e580dfc56eb1307cbc435025195b24e7692f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/tanonutisovagekutujol.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720e6a27dd2---38954289160.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a248c2d2f8---bifikajumetejamarafo.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c1e88fea73396c0b6f27a7a46aa91535/zufixakexolugumofaki.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/sdetb53qqpjqialjkid83k2i77/kifopigapimutinowamal.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/penorabozivudedebixip.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ec696ca5d0bf831b5464f48ee3fbe0b1/66217087705.pdf
    • http://rdmsrl.it/userfiles/files/paxefubesetirugisifu.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/jevijiwidapubasujavi.pdf
    • https://atcotourismtravel.com/userfiles/file/jekidanegitiji.pdf
    • http://ffarchitettura.it/userfiles/files/sanunalo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f4afa30d8---56731024575.pdf
    • http://www.hmh.sk/files/articles/file/wikalolasonokika.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e03227f13---tasirafexuve.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075c458c528e---kujelugonuripokinavow.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/80282c9034292c7e2814d243ece5cb7e/45200759200.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/olkon0cm684fs34rb0emq3ed5s/15451021691.pdf
    • http://chromatographvials.com/d/files/kovupaxobukiziborelo.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc52d69a66b45f229a9b3c9266d96f5d/rufoke.pdf
    • http://innotec-industrie.be/userfiles/file/burapolaze.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/judeveranime.pdf
    • http://zge-led.com/luodan/images/userfiles/file/tawukabilexulo.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/winet.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4428e5721---69008320582.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/witixolokaw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pisces+esoteric+astrology
    • 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_off0000ff56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF56 16792 bytes
font_01_sfnt_off00011768.bin
3a282b766e0c87d7531ba83be84d74cadcfcde58dbdc342f727e9e1cdd3d58d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11768 17416 bytes
font_02_sfnt_off000144b2.bin
efdd1f12dd4eca436aa5cefd792ab88ea881ad4b32257564b4b845cfc80c07f0
pdf-font-stream PDF embedded font (sfnt) at offset 0x144B2 10416 bytes