Malicious PDF — malware analysis report

Static analysis result for SHA-256 842fed0438f7d94a…

MALICIOUS

PDF

96.6 KB Created: 2021-06-25 18:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c1a8485e5e978acf4f318c5b30e93a SHA-1: 5743bded0876b3a9921b301fc67f6e6649e85d12 SHA-256: 842fed0438f7d94a699ae7af0515481e84c0cc9da48c4a35b611b72859aab60c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting it's used to redirect users to malicious content. The PDF structure and numerous external links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://performanshost.com/calisma2/files/uploads/badamumaxa.pdf
    • http://logisticsnetworks.net/ckfinder/userfiles/files/mafunamatuxapale.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e2add514dda6197936ae8208b8d23d26/69881637183.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99f30bcae---varinudawe.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hcthkoi8tg983kqa65kubseqe1/gozizufomodufuputarukun.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-22/20210522093313456630.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160842695ad36e---xulukivatewejodira.pdf
    • http://ecohost.ru/pics/images/file/37715665600.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc52a2fbf---lifarevesobu.pdf
    • https://szekszardportal.hu/userfiles/file/45827141281.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d7eeb513---toxuwetuxitonadax.pdf
    • http://playeasypiano.com/resources/fck_images/zawivupis.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81fb0d5b4ab24501f38790f9092388b2/gaxinigege.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/289f14d8e4052f4bdc6a565da9c0d110/wipaxunuxurodube.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1619bce1ea9cc4352596c72478f2826d/14476097258.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4749735005---tewobobogexotovi.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4921d67c1---faxisaxoselovozibodivele.pdf
    • http://espacioschillout.es/images/admin/file/31726181225.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2b74b2fa3221a9c09cc247d1f36ef525/terixusojipizugek.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8ef05f528ad6100fd9505b64e4ea28ce/65514712272.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=amharic+books+download
    • 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_off0001153e.bin
0c3698b48d34c2bb081c07afe30d44bfc75860b6fa0e87b21c2b04c09305f2a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153E 10704 bytes
font_01_sfnt_off00012da3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 16792 bytes
font_02_sfnt_off000145b5.bin
2fdf19fb2d7479d1c21204d84a6109f3814fc3751db0bef231aea29498808bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 18172 bytes