Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16f466315d31c22…

MALICIOUS

PDF

74.9 KB Created: 2021-08-28 00:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6b2042eb7542ab62b743436a1e8c4c2d SHA-1: 17dc0b05aedde461daf42679c16b1ccbee743f29 SHA-256: a16f466315d31c2292d80958411c359ed82ef11e6d11ca4fea8bce864b2875a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45379b337---gexede.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2p8gi439qd7vpdg567negnv5u/lusasedawev.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jedodefurumakinak.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/80089310085.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/46641049500.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/fanid.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/66249694750.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/lupuza.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/86898672805.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202108270126277146.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/nagipiveboralomowanojurup.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/766360fb6a923c0b599d0fb04450f78d/45996286286.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/zuxekaguz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c994611b367---nokez.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/gakiditiwiturodefojasenug.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/1779560041.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/f37eb6b3eb75424ab1130cb0dac0d077/vimokuwozifufokoza.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/womegubip.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/momimuzalibovagosezizeni.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/zizap.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a3c740f1249ad8da8fe0c791eb5048d8/64661046348.pdfIn PDF document text
    • https://menu2uplus.com/images/file/31777010000.pdfIn PDF document text
    • https://castel.ro/userfiles/file/51470169801.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/vojipuzavezixonekopelos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=everyday+sociology+reader+2nd+edition+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_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 17152 bytes
SHA-256: da79451ddbd30eb39ef832c644e05be5f53c4ba936a072efed62ace065e8acb5
font_01_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 11080 bytes
SHA-256: 7a36a73270b669ac9c2963f5f0e9db09d922e0498818f5cbbbb320adee96dda2
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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