Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb13877dfaadf58c…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 03:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bbe2e8124ce8ae67eefd9e07b6c2ccc SHA-1: d8903c0d832ade1a1113e20639b185a37b13915a SHA-256: bb13877dfaadf58c9fbfca484080ba2ca0adad938c24c2eac5ca59ffecd53359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple compromised CMS upload storage locations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/bcd752fmv7v1g5i3fq2o9b4j67/memorudavakoxawenenejul.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b59c53d5f---fonozoradatoriposifovaza.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v2rd6ip9jcr7b14lamgd4evut8/86110364468.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/poe2n1ulrsicph5eofbl3mhv16/vasexodizawiku.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b50408b2fae---87096552179.pdf
    • https://securityguardsupply.org/php/uploads/file/fofovijugulabakeg.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/b4512766a7393848680174bfbf297847/10187649378.pdf
    • http://progfin.pl/userfiles/file/44419727898.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pgjkls8cdltklaqf6rbnohbdkl/36714313138.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0321965562063cbdf9cb87a6fda7e554/99224537009.pdf
    • https://zlato-eu.cz/upload/files/15287641870.pdf
    • https://davidfoleyinc.com/userfiles/file/tasixusutiporedukotobisum.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9954f4dd0a17d0e34185e59f3e5fe1c8/83649168470.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/eba7a553145cf3a411fd7c8af17d1d45/20634349665.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf0932687---66104423924.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/42309971334.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b231996a995---49242248657.pdf
    • http://hollywoodterrace.org/clients/863344/File/74040129411.pdf
    • https://a2designbg.com/userfiles/file/rikebasonasez.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/6rd0kftjj1an7kp8gi3pt983nk/gubexamipiwewijipilek.pdf
    • http://softtox.com/new/userfiles/file/jobomivijijanojirev.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/u7f5bthg1qmp7m6l1e8083higa/58513990572.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98461009152.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45bfbc91dc---lazofujuzebanuwevetadim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bollywood+movies+releasing+in+january+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 16792 bytes
font_01_sfnt_off00010563.bin
851b9d0c9afd81e9472e0ab4073e9483ff5d3efba23afaefdfa9cc549eca988e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 18128 bytes
font_02_sfnt_off000133e4.bin
85e4a04473bd2b7452475d541ad5906152eae7033dabd04140c3953c20379bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 11284 bytes