Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc750024bf580cd3…

MALICIOUS

PDF

125.1 KB Created: 2021-08-17 03:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 6b04035484f5778912ce4cc80d8fc940 SHA-1: c9b1c01fe51bcda8906a29ec71d602f831a6e333 SHA-256: fc750024bf580cd3fa6ac1391f0a46f7384ba7833e943cb2f0c5ebc646090a4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bb8ec95de---tozuvawogajukawutada.pdf In PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vijajebogerulodulubewi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/zisefuwo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb14379a5a---23130163471.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42a47bc95d---judatisagupokegipujax.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16257140151278364319.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/fipikanixudetixevo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a0e2f470---mulovukujivomosenovigi.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/99838961203.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/37785778205.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/wipilikesawemosonikuve.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a3d5d5ecf---tujisoz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebb559c931---niwirapo.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/19328307870.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wutuvaguvupi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ae73cd5e34adbf032f3a1c2f45102f1a/40075297937.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/tctms1e7opmtkvta8b3ph8enn4/63320381298.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b39cb02d3---gurelomunap.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/xusopezezotin.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102b5fb68f72---waderumaranu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/kuxisagibew.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/83715513216.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156751fa88---73216254739.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/zejakowerutizurisuxurokok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+1.9+indir+team+extreme+1.16.4PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFC 3456 bytes
SHA-256: f9429645c5a96e1bc9b9720c1981e954a08512226d26e744f5a0a98519720c5a
font_01_sfnt_off0001697f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18190 16064 bytes
SHA-256: a013ce2342554bbd70a9f85285a6053b67e9b25eaba0dd22223cc179b1b1ea16
font_03_sfnt_off000196a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196A0 20584 bytes
SHA-256: ab84e7a7b9e05d9e490b04b8b2a06c27255e2807da0660c50f7669d7ea496271
font_04_sfnt_off0001c946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C946 10928 bytes
SHA-256: f4a74a9685277895bf5cbee8b1f5ac5a835b2878eb0a13e0ec3e2724a6a3872f