Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa24820d94848be…

MALICIOUS

PDF

87.4 KB Created: 2021-08-31 06:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 27f12601b3c97fa46ab35cb3ee7f4b19 SHA-1: 4c3cf0879c69f58bfc92ff7381b900172313957c SHA-256: faa24820d94848be3002c7c8aba6ddc6b1190851701eef83d9572411ac06c14c
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised URLs. The document contains a large number of links, many pointing to potentially compromised WordPress upload directories or disposable domains, suggesting a phishing or spam campaign. The primary goal appears to be directing users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aihr-iadh.org/uploads/FCK_files/file/67103505520.pdf In PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/sobozosovanidetewiwumob.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rugusitubovikeg.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083962b18bdc---woranokiretoxepimonibeti.pdfIn PDF document text
    • https://pindimana.in/uploads/file/vosefotivisuvulafal.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae088299131---zudaxefazumividilip.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/40016322670.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/43016728956.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce685f7a1---dotedetowexeni.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/87178454328.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/xazerosonolozivuxolataf.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/87186538850.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/vapusotesinubudemax.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6baae75c18---96043358317.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/3082491144.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/rojigituxasawi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/68817011599.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9813039d7---wukexo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/tefuvabupifaxasisugidijif.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f89a993ea---wiwiwilevexel.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/84106250767.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vubojusazedupivawuzubo.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/parenojademanod.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cfcd3523---49520807506.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wizesaregebibukuwomejojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+miracle+worker+book+online+freePDF 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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10616 bytes
SHA-256: 639d1b28898c1cd7c0943dfea1191877c827f8007e976c4f8a9338ee399ad302
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 16668 bytes
SHA-256: 93b04f5034f05bc03e7755cd265ecf31c05d9a4c17cafe6a47b7a5eda83a50f7

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