Malicious PDF — malware analysis report

Static analysis result for SHA-256 44518f3f9c5d3a29…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 74f37e165a96d5cb7b0f3e2b3c5c35f3 SHA-1: 9e7d991870e5e2fad20151019d54799166b0a5cd SHA-256: 44518f3f9c5d3a2991dc49d474b427b9a0b1f71d1439db00ff2d76fe5cba5218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609df7c69b06c---biperemusejalivizikemejas.pdf In PDF document text
    • http://poltinik.ru/userfiles/file/70278049556.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083442494ea0---80067318425.pdfIn PDF document text
    • http://unityproductions.com/upload/files/fiwidekovabo.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/63225268609.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/dajadonasinitudel.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/mubelugisipu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234f0adfa2b---21546894425.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/54078271136.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8f11de35e51099c8524dbbed8d5cf665/gagebomasuwezojuwujo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2mtt8bssh54ih8k0115rr2p7nq/69959765090.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/75980529487.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/jizokewavuvutoxazixuta.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/bosiveb.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rkub7fu5fdg7brhgoulg9aubv5/xijonusopodirijomofus.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/220232087499.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610809449a9dc---99310764262.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/48575867000.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/nuwuterugukemarebojo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f3b3f43a---zafavatowexixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=c300+mark+2+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0b32eaf9cf398c4509279fffdf2edc3a/wegutisumituzazuxobuwiji.pdfIn PDF document text
    • 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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 10296 bytes
SHA-256: 37f88512fce14ab091b7a7f52cfb4c8cefb66b22fe105b4960a616f832fca8c0
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 17556 bytes
SHA-256: e4c629d0caf01dfa9840355207269d113349dc6aa532a745ab67977b43431aa4
font_02_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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