Malicious PDF — malware analysis report

Static analysis result for SHA-256 805622614b36f12b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 17:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 432a63edc944c617ce7937ef3b33ffed SHA-1: 6376f17ebb464f623cbb1a84abf5d012efafaca2 SHA-256: 805622614b36f12bb46025d9ac52675e222e7113cc5494203876c2d9c44a13fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c380672d950---xewolewojutubiwivero.pdf
    • http://hndgyl.com/v15/Upload/file/2021620335291021.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/51ab016d0425cc4730e05f600d2c1295/tubesidof.pdf
    • https://caraudioshop.ro/mm/file/25851839227.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cf3cdb296b3643f0eb008cc1f43c1a9b/68327757067.pdf
    • http://tipiland.net/upload/file/tukovobidifixajukedowi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d2b74bb98---51875485531.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/810d20e7588bdf25126cb1f55b37c59a/mujixuxufojepinoga.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafcb15b64---zijeje.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf8f0e797---gawam.pdf
    • http://ahcxdq.com/uploads/file/020120355662.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/708d3723f7a7fdd577a49b903d151415/1919996638.pdf
    • https://muguet.fr/sites/default/files/file/99975982116.pdf
    • http://coachhouse.info/assets/file/77574859807.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/50927857752.pdf
    • http://www.bash.cl/media/file/22642059765.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc144ea89ef---67282109085.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5b13c48a106877c32f2b665b82bcf5a6/mavazikigabejowe.pdf
    • http://adaviestransportltd.com/userfiles/file/91847947196.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072072389402---vutuxoxomabonaxoz.pdf
    • http://takramaipai.com/mypicture/file/jodaniket.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/08b4de07b897e986e2a4b29ceeae1862/nifoxoj.pdf
    • https://cezartravel.hu/userfiles/file/91218493150.pdf
    • http://libron.pl/fckupload/assets/file/jubevalapolo.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/46136151943.pdf
    • https://istanajp2.com/contents//files/kejemokesixisuvufemi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=our+sun+is+a+star+of+spectral+type
    • 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_off00010af7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 16792 bytes
font_01_sfnt_off00012309.bin
94bfdae72063b745e8d26633921308b6ee71eefbd40aaade8bf0c9d3cad9d112
pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 17696 bytes
font_02_sfnt_off0001512d.bin
dda2be139beaf437458adb79a2d3380d13b7d35f4cba8b7acb5ea4a72bdd29d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 10712 bytes