Malicious PDF — malware analysis report

Static analysis result for SHA-256 44938afd11782d83…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 17:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18ed013385aaeeaebd95c8a7430a211e SHA-1: c752832aa4822b1954c0885d93662ae42bdc91d5 SHA-256: 44938afd11782d8377862bc57d761634e37b3218e46a84a978de8bf27b71f271
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cqc-material.com/app/webroot/userfiles/files/xokutalusokekipus.pdf In PDF document text
    • http://www.jasfec.com/imgs/uploads/53637507607.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/20779148927.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/7319334124.pdfIn PDF document text
    • http://aurora-c.jp/files/files/nosalukak.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425689909dc---xoxulifarika.pdfIn PDF document text
    • https://timminsrenovations.ca/file/SkiXb5Aq3wsin1pI.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/eceab57e77007ed35758ae962a222b59/fudikiwoxafukijejomag.pdfIn PDF document text
    • https://phr4u.com/files/32727859525.pdfIn PDF document text
    • http://davcpundri.com/css/file/tosarobozuriledidaro.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/bajapakejowafemukiz.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/18921780873.pdfIn PDF document text
    • https://cubic.is/userfiles/file/nilebuvofugowibonezuse.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/17170048747.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/11007953949.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/66111265404.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zigugigajereputonate.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088b610c1e---mexadoji.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/1325191791.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/terodidasivek.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/68139430169.pdfIn PDF document text
    • https://hiroyoung.com/data/files/dipibekeda.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/91386334902.pdfIn PDF document text
    • http://goldmustang.com/files/files/vesejagofuvurenupezoke.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/99023093538.pdfIn PDF document text
    • https://susta.vn/userfiles/file/49721551231.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090523461973499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=smooth+slow+motion+app+for+androidPDF 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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 10792 bytes
SHA-256: 4406acf6e601772b31c741770a04e0b50cd04bf10cfebdcb3567d77f7e75eb91
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 20208 bytes
SHA-256: 49556eec0febf512e2c4e499d80129f0f5c76175b51c9efc0bb536f7fb906376
font_02_sfnt_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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