Malicious PDF — malware analysis report

Static analysis result for SHA-256 1452d883a1557e05…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 20:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 044b7c1e4349495c8967eb83ac21c47b SHA-1: 14bca0354ad41490fc152eb698727832642eac7e SHA-256: 1452d883a1557e05bc18fd0aafcdd4240112acfaddabb8f47487ebb28c5dc1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS uploads. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7a744ee8966a0ca0c8579bf079b77926/satusun.pdf
    • http://akinmedical.com/uploads/file/12112450322.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/movolepiripixonaju.pdf
    • https://szekszardportal.hu/userfiles/file/vabejerarigididexomebumi.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c17a25a0ccb---vosipakuligumuxeferevav.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf8cd67fe---vavupowukedesafu.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a124d2063---wojotijutelu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f926f66d114662f5141fd54030cec07f/gevuwamuwixofufel.pdf
    • https://bodegoncriollo.com/userfiles/file/8035133414.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0f186ca3---50258703832.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b297b4cf66---66443592342.pdf
    • https://soechi.id/userfiles/file/jusatezujotej.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5a4b676f313595df1c1b9dff290fd227/xupibipesumunojo.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/67cl45bd4fc437un1c4rnsssfo/zipepulititiz.pdf
    • http://euroinstytut.pl/galeria/file/93192957819.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72e24b6aa---30995289646.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/58r5ird444iisdvnousulu3s6n/99753113360.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b40c780c1af---33703595591.pdf
    • http://ankurgroups.com/userfiles/file/loduwineronuva.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0ae371bde1013a998fd8443da6ac9d6/17463087202.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/girrmn9avto25hivqstmr88m76/tudagakapar.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/37d84dcebf5763b86a4695a8f303c3b9/85221871668.pdf
    • https://angelsstaff.com/uploads/file/zevaleduwewiguval.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+how+to+use+loom
    • 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_off0000ec70.bin
8b7eddf1f656035425938bc0cd7e549c336f08930c6211dad8b956378727a329
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16784 bytes
font_01_sfnt_off00011836.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 16792 bytes
font_02_sfnt_off0001304d.bin
cf32538a0c2583034520bdcbee0cd13bee8f9918ab0cac09d7fd7d511a6133df
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304D 10780 bytes