Malicious PDF — malware analysis report

Static analysis result for SHA-256 36607c55c92bffb1…

MALICIOUS

PDF

105.8 KB Created: 2021-08-09 04:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2727b746eb8de5a100d005ceacc1c026 SHA-1: b281e0e89735c61554f772dd30747fcbd28dad14 SHA-256: 36607c55c92bffb159f38f9424a10459f83b4a3fdc57505683209cd3f9ecd19e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous PDF files on compromised WordPress sites and disposable hosting, likely to obscure malicious redirects or phishing pages. The presence of many distinct hosts and the use of UTM parameters in some URLs suggest an effort to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://puntolinea.org/userfiles/files/mosesu.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a6490b13b746eb877d4b3e376a0b1295/23344939079.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/59a9544978037512fc39afee5ded5094/janirimebuworetif.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/74773016552.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/35f658bf5204a714841a8d43fad744e4/wifot.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c44a324567b---90968659628.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d30b29116c5bd5bf7ed865b912cb0141/22331056383.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c855c68e0821a7a2ae13d63147d84a34/vupidup.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608588125102d---63931351030.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/20523082617.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/09a002e862f6a2204c9d7333e5037982/fijuzupamogara.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/vtl8bpakvropm21jsq6j2n456e/nakajuxiniziwaxedev.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160db50a63f764---kapawanokameg.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be620321f89---sexiponar.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d36f6ad806d39f693ec25dbab33e5ea8/98034988255.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/73d83qtcgdtqfpm9htf7j4gc8g/98981977116.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/93426730576.pdfIn PDF document text
    • https://sapporopools.com/contents//files/wukikuxu.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/lisawu.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/pedudibe.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db2769285e3---gitemegujepodud.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084304f2d4bb---nanemalafodepejamoxabar.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/7457933807.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa0a4584d---18674571701.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ee2if9023b48att5hbqvee11he/mamebosovuduvoganot.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/10640153572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iron+mike+pitching+machine+instruction+manualPDF 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_off000135ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EE 17932 bytes
SHA-256: 372961a9700a77978ccb2930d8da2e4beece44a07c644c39dd7a5b3cb39b74cf
font_01_sfnt_off00016525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16525 10964 bytes
SHA-256: ba8efb810173c500850be7d204bce58c12353d32fe8a64ed12c7ecf075d43ea2
font_02_sfnt_off00017e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.