Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d89d8fb0a30a30…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 12:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 003bd642fb1b587ac3ed04fea8a95ff7 SHA-1: 2906955e894d0ff99dd56aae69a9ed6e2c6f5cf5 SHA-256: b4d89d8fb0a30a30bfe94ee2860ca0aad7332faa0fb1287b016638068ec82526
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161148adc56f5e---87098924576.pdf In PDF document text
    • http://studiofagiani.eu/userfiles/files/77473197793.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072affee6b11---51797917831.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612521cda0ada---vuzufoti.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruraxi.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/82042311499.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c58d6d5ab28eba76ae043e6f197a0ad3/fogijajumimixowaru.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6848a4409e6a8f2a8f38bdbc0bc17da6/60688968442.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ablu23h0ms5nb6h0m5s66l45pf/josinubo.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/23318133471.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/sebofuk.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/35731522010.pdfIn PDF document text
    • http://sparkpro.lv/content/file/48793223508.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7a5644ab---99359926880.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c50da6cec---gunezuwuwepu.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/kiwitodonanusetamakixure.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/45897531828.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/depewusafijuv.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/54898359611.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/forako.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/lupagezaruf.pdfIn PDF document text
    • http://k1a.ru/images/files/file/5197471868.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bidovut.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/73493179451.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ad614e0f---96222441016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tom+clancy+books+in+order+to+readPDF 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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 17628 bytes
SHA-256: f041265149cad4bd8b345fcd3620612b99e7cd8fdd34c78c5b163bdd213ff294
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 10840 bytes
SHA-256: 07a2f0198b52ff07f933a6422fee6dfd99e8ed4580dbd59635750eccb20b7dc8
font_02_sfnt_off000122a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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