Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d03480427630c8…

MALICIOUS

PDF

97.3 KB Created: 2021-08-05 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e220fe04bfdd224c0be61ff37038e02 SHA-1: 02c0fb3e15e960939bc8bb891790e1d73640cf91 SHA-256: 99d03480427630c8e021969208ea5ae2c63ca07b889612fe760b3dd12491aa20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to compromised websites, likely serving as a link farm to distribute malicious content. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=netflix+hack+apk+2019+pc PDF link annotation
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875ef663916---keposarofivuxi.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/zabide.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9c1f17d3---91858013325.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea6b2696c---24893153229.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/vopepigolupimaropi.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/31780525008.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f8e106aba---fobogapozinobemekapotigo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64abbd1cc---1076766796.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643954c75b---92626389659.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/67157381277.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/aqkbpp68a29ai53grachghofu1/11876839406.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8469v713abq4llgmunrg28ngk3/vofaresosod.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/mozava.pdfIn PDF document text
    • http://teplospectr.ru/images/files/68687898959.pdfIn PDF document text
    • http://deltools.com/userfiles/file/jofiketerakobajatav.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/29563551286.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/02ndg2edc83486q6dqg1dichg3/2087405119.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9597ef083---kisimajijogosidob.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7b8101b0d---9867443964.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d9fb6098---bowakejobatedewitif.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fujowajasenipokode.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cf090a1a81d8d9e39d780499fba77017/lufokoruxewo.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/64473282694.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/mebarazedebolu.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210531_AEBCD13441F6CC5E.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/carbbpt6mm664tp5ebtpo4rnn4/potelobova.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/penoforotipimobojigix.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 19568 bytes
SHA-256: f3d24f2c912750dc7923ac952d7117e413c471d76a47fa963c2a47104538eab4
font_01_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14481 10720 bytes
SHA-256: 257818dc0a2ad8c851a68945ea1ddbe5ba0aa66321586091ac22ac60550ba48a
font_03_sfnt_off00015d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5C 16720 bytes
SHA-256: b0d0952d3e590403c43a27647ef8a8ec5e0ca8aa71a96e94f24a094d9c09295f