Malicious PDF — malware analysis report

Static analysis result for SHA-256 a528538aa1ce8614…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 03:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06f1194c38a0940e68212e83cb9d4a83 SHA-1: af3ca0d965d31289849cba33540b04fc9453a9c4 SHA-256: a528538aa1ce86147312027abbec136a8418590e709bd97e670b51ed101d3a2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised or disposable domains, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://prplus4u.com/ckupload/files/19331073356.pdf In PDF document text
    • http://sp3siemianowice.pl/userFiles/files/99426755502.pdfIn PDF document text
    • https://avenue102.com/uploads/file/konudodopis.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2c6c66eff34a5f0ba72167cf13423fcc/raxejif.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6931a8011e551b7fbf62c6ed5598825c/karedusepajuzogerebobexi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9294f115c3---vituzowozubeta.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4db2f323---93608488820.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/708ad0j4t3ac6c48r6kvosgtei/mujapizunesazegodobad.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/vevoromoruvefu.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/18463335354.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/56940055466.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/75716896895.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/f85fe987e2efb42449f9b83320694dd7/71976595053.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/7239532473.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4aa2944be---sizawunis.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/66051308805.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/nho4hj3pfgg5rh8i9u4euh1q70/86327043782.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7rfnpc2sc6b7ku60b8gtl1hbu7/40592539618.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/13707767520.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/27538992259.pdfIn PDF document text
    • http://techbis.pl/files/file/jigix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=psalm+61+commentaryPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 17968 bytes
SHA-256: 00303244fddca49e213675061a6477526da332f48207b23aa9f8e98ca67c1d2f
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 10636 bytes
SHA-256: 5a183ab76df12692037fe30fd3ff078421ab0a3c89b387de26952efdb7bef89e

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