Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaed4c3ea43f4782…

MALICIOUS

PDF

88.6 KB Created: 2021-06-25 17:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2ce2f6d68b369ed0b157439d37e268a SHA-1: a803f7c8cacdc265928b92d4f3e2ef64a0700268 SHA-256: aaed4c3ea43f47820f79973da264f0d426f95795b14570fc6fc4478e02aef6a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attack. The PDF structure and embedded URLs are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fe639ad1face7df6a3e9a7c3617e66b1/luloputokenaluxinekifefob.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edc104cee---japokolapilakage.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec2936c276---61187976245.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b82182a2---rulurupokofagisitop.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd90fb9e241---vexozobitujiteg.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c55bb3318---tuwijudepavukipamivobuwow.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9c89b930bf77681e8b810f3c43b6f0ee/dowifevovifak.pdf
    • http://duonglaohanoi.com/userfiles/file/jotujasazijelogizowalalik.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o15m08vr6r9l9ekrjrodac6c0q/tinosujenemifaxuwiv.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37eae75940---33468727864.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acfcd0dc8---46456636121.pdf
    • http://bebelino.ru/userfiles/file/15285729389.pdf
    • http://begemot-rus.com/uploadfiles/file/2021062115042273499.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8dd56732f---85419773751.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/iqaac6jcg8qo9nlp1fj0asmmq5/lipalurisafigow.pdf
    • https://orrizon.ru/images/file/juleliler.pdf
    • https://oklogistic.lv/upload/file/vafog.pdf
    • https://italvaping.com/file/nukosedezeroweg.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b630aebd3a7578d992afba24483efbb5/88867824638.pdf
    • https://rrr71.ru/upload_picture/kinupetevupabatonojunomok.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8028954029---98769500445.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/kixamujuzogidofinevipi.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2f1r7ktvgchlgjml2ob7n8muf0/12168279818.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=poor+hygiene+meaning
    • 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_off0000f879.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
font_01_sfnt_off0001108b.bin
20d6586ba2fe27d122f753a2f41ab1f1f84b09e1c87291576f62f0fbf26d9c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17452 bytes
font_02_sfnt_off00013e59.bin
ab148c0cabeeaa73110e54c0c54fd8fe293f3c78abf34792851cedf2bb2f516f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 10356 bytes