Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec9303309fb3e04…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 14:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b96f834acdecf2162ba79884a1fa503 SHA-1: 243525d962c2138d10a3e92f7de5439669c0b3c8 SHA-256: 9ec9303309fb3e04b5a159e31d6ccc41d02aa58a6324d3ddc969fbd5ea78d225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to host malicious content.

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df66fd65---livanegafizodibevebe.pdf
    • https://arerp.kr/data/file///debubavenilufufavofedufod.pdf
    • http://jiangsutravel.kr/userfiles/files/20210608_111953.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bd969ak57imup86sdam2vpvk7f/99234389493.pdf
    • http://frezerovka.by/images/fxeditor/file/51505692769.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rus21n1s5hrvgterrtc07cd891/82392865338.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/golesowitoroxilize.pdf
    • http://sgpeo.pl/users//file/seduzu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608987c3c80ab---90939252279.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f110ff2b21---12100903274.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7de9eeb65---parusepowawukatego.pdf
    • http://mywayrtk.info/userfiles/file/11273442528.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/bb2ntghslanf3f5s6fileeh3p5/xenexopefif.pdf
    • https://tmtteks.com/files/33053250294.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5f29e8d3---mitafubova.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4f44e9498---76545793958.pdf
    • http://arch-teh.com/pic/userfile/59856098597.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/zibafulavexomijizuveta.pdf
    • http://tms-technology.com/ckfinder/userfiles/files/37886076446.pdf
    • http://sacoorhealth.pt/site/upload/file/ritikokefatexuvebu.pdf
    • http://bright-inter.com/file_media/file_image/file/siluboburije.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bde0e487b---kokozunowarug.pdf
    • http://shinies.ru/img/lib/file/pesinipivof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=example+of+mechanical+energy+to+sound+energy
    • 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_off0000e69c.bin
0f0ad02a714b0e5350ec6162b329435682884781f0799bdc813cf2c5fd4761f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 18036 bytes
font_01_sfnt_off00011622.bin
5e6da547e2da8a218d867ff0ce2938fd6e29c505bfa609701d50ce8c1564fbf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11622 11368 bytes
font_02_sfnt_off0001308d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 16792 bytes